Methods for treating pancreatic cancer using combination therapies comprising liposomal irinotecan

ABSTRACT

Provided are methods for treating pancreatic cancer in a patient by administering liposomal irinotecan (MM-398) alone or in combination with additional therapeutic agents. In one embodiment, the liposomal irinotecan (MM-398) is co-administered with 5-fluorouracil and leucovorin.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a U.S. National Phase Application under 35 U.S.C.§371 of International Application PCT/US2013/045495, filed Jun. 12,2013, which claims the benefit of priority of U.S. ProvisionalApplication No. 61/659,211 (filed Jun. 13, 2012) and U.S. ProvisionalApplication No. 61/784,382 (filed Mar. 14, 2013), all of which areincorporated herein by reference in their entireties.

BACKGROUND

Despite improvements in cancer treatments, there remains a critical needto further improve therapies so as to prolong patients' lives whilemaintaining quality of life, particularly in the case of advancedcancers such as pancreatic cancers that often are, or become, resistantto current therapeutic modalities.

Incidence of pancreatic cancer has markedly increased during the pastseveral decades. It now ranks as the fourth leading cause of cancerdeath in the United States. Pancreatic cancer's high mortality rate isdue to a dearth of effective therapies and a complete absence ofreliably durable therapies. Because of the location of the pancreas,pancreatic cancer is typically not diagnosed until a tumor has becomelarge enough to produce systemic symptoms. This, coupled with theabsence of good screening tools and a limited understanding of riskfactors, results in patients usually having advanced disease, oftenadvanced metastatic disease, at the time of diagnosis. Metastaticpancreatic cancer has a dismal prognosis and is almost uniformly fatal,with an overall survival rate of less than 4% at 5 years.

Chemotherapy with one or more of 5-fluorouracil (5-FU) and gemcitabinehas been shown to prolong survival in pancreatic cancer. Combinationtherapies including folinic acid (leucovorin or levoleucovorin),5-fluorouracil, and irinotecan (FOLFIRI), folinic acid, 5-fluorouracil,irinotecan and oxaliplatin (FOLFIRINOX), or, less commonly, acombination of folinic acid, 5-fluorouracil, and oxaliplatin (FOLFOX)are also used to treat some pancreatic cancers. Irinotecan is7-ethyl-10-[4-(1-piperidino)-1-piperidino]carbonyloxycampothecin, IUPACname(S)-4,11-diethyl-3,4,12,14-tetrahydro-4-hydroxy-3,14-dioxo1H-pyrano[3′,4′:6,7]-indolizino[1,2-b]quinolin-9-yl-[1,4′bipiperidine]-1′-carboxylate.Irinotecan is a member of the topoisomerase I inhibitor class of drugsand is a semi-synthetic and water soluble analog of thenaturally-occurring alkaloid, camptothecin. Also known as CPT-11,irinotecan is currently marketed formulated as an aqueous solution asCamptosar® (irinotecan hydrochloride injection). Topoisomerase Iinhibitors such as irinotecan work to arrest uncontrolled cell growth byinhibiting the unwinding of DNA and thereby preventing DNA replication.

The pharmacology of irinotecan is complex, with extensive metabolicconversions involved in the activation, inactivation, and elimination ofthe drug. Irinotecan is a prodrug that is converted by nonspecificcarboxylesterases into a 100-1000 fold more active metabolite, SN-38.SN-38 is not recognized by P-glycoprotein, a drug transporter that playsan important role in acquired drug resistance by pumping certain drugsout of cells, so irinotecan is likely to be active in tumors resistantto other standard chemotherapies. In the body, SN-38 is cleared viaglucuronidation, for which major pharmacogenetic variability has beendescribed, and biliary excretion. These drug properties contribute tothe marked heterogeneities in efficacy and toxicity observed clinicallywith irinotecan. Irinotecan hydrochloride injection is approved in theUnited States for treatment of metastatic colon or renal cancer and isalso used to treat colorectal, gastric, lung, uterine cervical andovarian cancers.

There are few approved treatment options for advanced or metastaticpancreatic cancers, particularly for those of exocrine origin.Single-agent gemcitabine is the current standard of care in first-linetreatment of advanced and metastatic pancreatic adenocarcinoma. Inclinical trials, single-agent gemcitabine has consistently demonstrateda median prolongation of survival of 5 to 6 months and a 1-year survivalrate of about 20%. Single agent gemcitabine was also approved as secondline treatment for patients previously treated with but no longerresponsive to 5-fluorouracil, with a median overall prolongation ofsurvival of 3.9 months.

Based upon what is known of the biology of pancreatic cancer, a varietyof targeted agents have been evaluated, but only erlotinib, a proteintyrosine kinase inhibitor targeted to EGFR, has been approved forfirst-line use in advanced pancreatic cancer, and the approval is onlyfor use in combination with gemcitabine. The co-administration oferlotinib with gemcitabine resulted in a statistically significantbenefit in survival, and improvements in median survival (6.4 months vs.5.9 months), and 1-year survival rate (24% vs. 17%) compared togemcitabine alone. Clinical trials evaluating other targeted agents,including studies testing the antibodies bevacizumab and cetuximab, havebeen disappointingly negative. Thus, there is an urgent need forimprovements in, and effective alternatives to, current therapies forpancreatic cancer. The disclosed invention addresses this need andprovides other benefits.

SUMMARY

Provided are methods for treating pancreatic cancer in a patient (i.e.,a human patient) comprising administering to the patient liposomalirinotecan (e.g., irinotecan sucrose octasulfate salt liposomeinjection, also referred to as MM-398) alone or in combination with5-fluorouracil (5-FU) and leucovorin (together, 5-FU/LV), according to aparticular clinical dosage regimen. Compositions adapted for use in suchmethods are also provided.

In one aspect, a method for treatment (e.g., effective treatment) ofpancreatic cancer in a patient is provided, the method comprising:administering to the patient, and affective amount of liposomalirinotecan, wherein the method comprises at least one cycle, wherein thecycle is a period of 3 weeks, and wherein for each cycle the liposomalirinotecan is administered on day 1 of the cycle at a dose of 120 mg/m²,except if the patient is homozygous for the UGT1A1*28 allele, whereinliposomal irinotecan is administered on day 1 of cycle 1 at a dose of 80mg/m². In one embodiment, the dose of liposomal irinotecan administeredto the patient homozygous for the UGT1A1*28 allele is increased afterone cycle in increments of 20 mg/m², up to a maximum of 120 mg/m².

In another aspect, a method for treatment of pancreatic cancer in apatient is provided, the method comprising co-administering to thepatient an effective amount each of liposomal irinotecan, 5-fluorouracil(5-FU), and leucovorin, wherein the method comprises at least one cycleof administration, wherein the cycle is a period of 2 weeks, and whereinfor each cycle:

(a) liposomal irinotecan is administered to patients not homozygous forthe UGT1A1*28 allele on day 1 of each cycle at a dose of 80 mg/m², andto patients homozygous for the UGT1A1*28 allele on day 1 of cycle 1 at adose of 60 mg/m² and on day 1 of each subsequent cycle at a dose ofranging from 60 mg/m² to 80 mg/m² (e.g., 60 mg/m² or 70 mg/m² or 80mg/m²);

(b) 5-FU is administered at a dose of 2400 mg/m²; and

(c) leucovorin is administered at a dose of 200 mg/m² (l form, orlevoleucovorin) or 400 mg/m² (l+d racemic form).

In one embodiment, the dose of liposomal irinotecan administered to thepatient homozygous for the UGT1A1*28 allele is increased after one cycleto 80 mg/m². In one embodiment, in each cycle, the liposomal irinotecanis administered prior to the leucovorin and the leucovorin isadministered prior to the 5-FU.

In another embodiment, the liposomal irinotecan is administeredintravenously over 90 minutes.

In another embodiment, the 5-FU is administered intravenously over 46hours.

In another embodiment, leucovorin is administered intravenously over 30minutes.

In another embodiment, prior to each administration of liposomalirinotecan, the patient is pre-medicated with dexamethasone and/or a5-HT3 antagonist or another anti-emetic.

In another embodiment, the pancreatic cancer is an exocrine pancreaticcancer selected from the group consisting of acinar cell carcinoma,adenocarcinoma, adenosquamous carcinoma, giant cell tumor, intraductalpapillary-mucinous neoplasm (IPMN), mucinous cystadenocarcinoma,pancreatoblastoma, serous cystadenocarcinoma, and solid andpseudopapillary tumors.

In one embodiment, treating the patient results in a positive outcome,wherein the positive outcome is pathologic complete response (pCR),complete response (CR), partial response (PR) or stable disease (SD). Inanother embodiment, the combination therapy with liposomal irinotecan,5-FU and leucovorin results in therapeutic synergy. In anotherembodiment, the liposomal irinotecan is formulated as irinotecan sucroseoctasulfate salt liposome injection (MM-398). Irinotecan sucroseoctasulfate salt liposome injection may also be referred to asirinotecan HCl liposome injection because irinotecan HCl is the activepharmaceutical ingredient that is used to load irinotecan into liposomescontaining triethylammonium sucrose octasulfate to prepare MM-398liposomes. This nomenclature may be used even though the hydrochlorideion of the irinotecan HCl reacts with the triethylammonium ion of thetriethylammonium sucrose octasulfate to yield triethylammonium chloride(triethylamine hydrochloride), leaving irinotecan sucrose octasulfatesalt as the entrapped pharmaceutical agent within the MM-398 liposomes.In another aspect, kits for treating pancreatic cancer in a patient areprovided, the kit comprising a dose of liposomal irinotecan andinstructions for using liposomal irinotecan as described herein.

In another aspect, kits for treating pancreatic cancer in a patient areprovided, the kit comprising a dose of each liposomal irinotecan,5-fluorouracil (5-FU), and leucovorin, and instructions for usingliposomal irinotecan, 5-FU, and leucovorin as described herein.

In one embodiment, the kit encompasses treating an exocrine pancreaticcancer selected from the group consisting of acinar cell carcinoma,adenocarcinoma, adenosquamous carcinoma, giant cell tumor, intraductalpapillary-mucinous neoplasm (IPMN), mucinous cystadenocarcinoma,pancreatoblastoma, serous cystadenocarcinoma, and solid andpseudopapillary tumors.

In one embodiment, the liposomal irinotecan is liposomal irinotecansucrose octasulfate salt injection (MM-398).

In another aspect, a formulation of liposomal irinotecan forco-administration with 5-fluorouracil (5-FU) and leucovorin in at leastone cycle is provided, wherein the cycle is a period of 2 weeks, theformulation of irinotecan is a liposomal formulation of irinotecan, andwherein:

(a) liposomal irinotecan is administered to patients not homozygous forthe UGT1A1*28 allele on day 1 of each cycle at a dose of 80 mg/m² and topatients homozygous for the UGT1A1*28 allele on day 1 of cycle 1 at adose of 60 mg/m² and on day 1 of each subsequent cycle at a dose of 60mg/m² or 80 mg/m²;

(b) 5-FU is administered at a dose of 2400 mg/m²; and

(c) leucovorin is administered at a dose of 200 mg/m² (l form, orlevoleucovorin) or 400 mg/m² (l+d racemic form).

In one embodiment, after cycle 1 the dose of liposomal irinotecanadministered to the patient homozygous for the UGT1A1*28 allele isincreased to 80 mg/m². In another embodiment, the liposomal irinotecanis administered intravenously over 90 minutes.

In another embodiment, the 5-FU is administered intravenously over 46hours.

In another embodiment, leucovorin is administered intravenously over 30minutes.

In another embodiment, prior to each administration of liposomalirinotecan, the patient is pre-medicated with dexamethasone and/or a5-HT3 antagonist or another anti-emetic.

In another embodiment, the pancreatic cancer is an exocrine pancreaticcancer selected from the group consisting of acinar cell carcinoma,adenocarcinoma, adenosquamous carcinoma, giant cell tumor, intraductalpapillary-mucinous neoplasm (IPMN), mucinous cystadenocarcinoma,pancreatoblastoma, serous cystadenocarcinoma, and solid andpseudopapillary tumors.

In another embodiment, the liposomal formulation of irinotecan isirinotecan sucrose octasulfate salt liposome injection.

In another aspect is provided a method of improving chemotherapyoutcomes by increasing tumor vascularity, the method comprisingadministering to a patient having a tumor an amount of irinotecansucrose octasulfate salt liposome injection effective to increase tumorvascularity and concomitantly administering an effective amount of achemotherapy agent other than irinotecan to the patient.

In another aspect is provided irinotecan sucrose octasulfate saltliposome injection for concomitant administration to a patient having atumor of 1) an amount of irinotecan sucrose octasulfate salt liposomeinjection effective to increase tumor vascularity and 2) an effectiveamount of a chemotherapy agent other than irinotecan.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a graph showing the anti-tumor activity of MM-398 in anorthotopic pancreatic tumor model expressing luciferase (L3.6pl).

FIG. 2 is a graph showing accumulation of SN-38 in tumors followingtreatment with free irinotecan or liposomal irinotecan (MM-398).

FIG. 3 is a graph showing the effect of MM-398 on Carbonic Anhydrase IXStaining in a HT29 Xenograft Model.

FIG. 4 shows the effect of MM-398 on perfusion of small molecule Hoechststain.

FIG. 5 summarizes the pharmacokinetics of MM-398 in q3w (irinotecan,liposome+free drug).

FIG. 6 summarizes the pharmacokinetics of MM-398 in q3w.

FIG. 7 is a schematic illustration of a Phase 3 study design.

DETAILED DESCRIPTION I. Definitions

As used herein, the term “subject” or “patient” is a human cancerpatient.

As used herein, “effective treatment” refers to treatment producing abeneficial effect, e.g., amelioration of at least one symptom of adisease or disorder. A beneficial effect can take the form of animprovement over baseline, i.e., an improvement over a measurement orobservation made prior to initiation of therapy according to the method.A beneficial effect can also take the form of arresting, slowing,retarding, or stabilizing of a deleterious progression of a marker of acancer. Effective treatment may refer to alleviation of at least onesymptom of a cancer. Such effective treatment may, e.g., reduce patientpain, reduce the size and/or number of lesions, may reduce or preventmetastasis of a cancer tumor, and/or may slow growth of a cancer tumor.

The term “effective amount” refers to an amount of an agent thatprovides the desired biological, therapeutic, and/or prophylacticresult. That result can be reduction, amelioration, palliation,lessening, delaying, and/or alleviation of one or more of the signs,symptoms, or causes of a disease, or any other desired alteration of abiological system. In reference to cancers, an effective amountcomprises an amount sufficient to cause a tumor to shrink and/or todecrease the growth rate of the tumor (such as to suppress tumor growth)or to prevent or delay other unwanted cell proliferation. In someembodiments, an effective amount is an amount sufficient to delay tumordevelopment. In some embodiments, an effective amount is an amountsufficient to prevent or delay tumor recurrence. An effective amount canbe administered in one or more administrations. The effective amount ofthe drug or composition may: (i) reduce the number of cancer cells; (ii)reduce tumor size; (iii) inhibit, retard, slow to some extent and maystop cancer cell infiltration into peripheral organs; (iv) inhibit(i.e., slow to some extent and may stop) tumor metastasis; (v) inhibittumor growth; (vi) prevent or delay occurrence and/or recurrence oftumor; and/or (vii) relieve to some extent one or more of the symptomsassociated with the cancer.

The terms “combination therapy,” “co-administration,” “co-administered”or “concurrent administration” (or minor variations of these terms)include simultaneous administration of at least two therapeutic agentsto a patient or their sequential administration within a time periodduring which the first administered therapeutic agent is still presentin the patient when the second administered therapeutic agent isadministered.

The term “monotherapy” refers to administering a single drug to treat adisease or disorder in the absence of co-administration of any othertherapeutic agent that is being administered to treat the same diseaseor disorder.

“Dosage” refers to parameters for administering a drug in definedquantities per unit time (e.g., per hour, per day, per week, per month,etc.) to a patient. Such parameters include, e.g., the size of eachdose. Such parameters also include the configuration of each dose, whichmay be administered as one or more units, e.g., taken at a singleadministration, e.g., orally (e.g., as one, two, three or more pills,capsules, etc.) or injected (e.g., as a bolus). Dosage sizes may alsorelate to doses that are administered continuously (e.g., as anintravenous infusion over a period of minutes or hours). Such parametersfurther include frequency of administration of separate doses, whichfrequency may change over time.

“Dose” refers to an amount of a drug given in a single administration.

As used herein, “cancer” refers to a condition characterized byabnormal, unregulated, malignant cell growth. In one embodiment, thecancer is an exocrine pancreatic cancer. In another embodiment, theexocrine pancreatic cancer selected from the group consisting of acinarcell carcinoma, adenocarcinoma, adenosquamous carcinoma, giant celltumor, intraductal papillary-mucinous neoplasm (IPMN), mucinouscystadenocarcinoma, pancreatoblastoma, serous cystadenocarcinoma, andsolid and pseudopapillary tumors.

The terms “resistant” and “refractory” refer to tumor cells that survivetreatment with a therapeutic agent. Such cells may have responded to atherapeutic agent initially, but subsequently exhibited a reduction ofresponsiveness during treatment, or did not exhibit an adequate responseto the therapeutic agent in that the cells continued to proliferate inthe course of treatment with the agent.

II. Irinotecan Sucrose Sulfate Liposome Injection (MM-398; PEP02)

As provided herein, irinotecan is administered in a stable liposomalformulation as irinotecan sucrose sulfate liposome injection (otherwisetermed “irinotecan sucrose octasulfate salt liposome injection” or“irinotecan sucrosofate liposome injection”), the formulation referredto herein as “MM-398” (also known as PEP02, see U.S. Pat. No.8,147,867). MM-398 may be provided as a sterile, injectable parenteralliquid for intravenous injection. The required amount of MM-398 may bediluted, e.g., in 500 mL of 5% dextrose injection USP and infused over a90 minute period.

An MM-398 liposome is a unilamellar lipid bilayer vesicle ofapproximately 80-140 nm in diameter that encapsulates an aqueous spacewhich contains irinotecan complexed in a gelated or precipitated stateas a salt with sucrose octasulfate. The lipid membrane of the liposomeis composed of phosphatidylcholine, cholesterol, and apolyethyleneglycol-derivatized phosphatidyl-ethanolamine in the amountof approximately one polyethyleneglycol (PEG) molecule for 200phospholipid molecules.

This stable liposomal formulation of irinotecan has several attributesthat may provide an improved therapeutic index. The controlled andsustained release improves activity of this schedule-dependent drug byincreasing duration of exposure of tumor tissue to drug, an attributethat allows it to be present in a higher proportion of cells during theS-phase of the cell cycle, when DNA unwinding is required as apreliminary step in the DNA replication process. The long circulatingpharmacokinetics and high intravascular drug retention in the liposomescan promote an enhanced permeability and retention (EPR) effect. EPRallows for deposition of the liposomes at sites, such as malignanttumors, where the normal integrity of the vasculature (capillaries inparticular) is compromised resulting in leakage out of the capillarylumen of particulates such as liposomes. EPR may thus promotesite-specific drug delivery of liposomes to solid tumors. EPR of MM-398may result in a subsequent depot effect, where liposomes accumulate intumor associated macrophages (TAMs), which metabolize irinotecan,converting it locally to the substantially more cytotoxic SN-38. Thislocal bioactivation is believed to result in reduced drug exposure atpotential sites of toxicity and increased exposure at cancer cellswithin the tumor.

Pharmacogenetics of Irinotecan Glucuronidation

The enzyme produced by the UGT1A1 gene, UDP-glucuronosyltransferase 1,is responsible for bilirubin metabolism and also mediates SN-38glucuronidation, which is the initial step in the predominant metabolicclearance pathway of this active metabolite of irinotecan. Besides itsanti-tumor activity, SN-38 is also responsible for the severe toxicitysometimes associated with irinotecan therapy. Therefore, theglucuronidation of SN-38 to the inactive form, SN-38 glucuronide, is animportant step in the modulation of irinotecan toxicity.

Mutational polymorphisms in the promoter of the UGT1A1 gene have beendescribed in which there is a variable number of thymine adenine (ta)repeats. Promoters containing seven thymine adenine (ta) repeats (foundin the UGT1A1*28 allele) have been found to be less active than thewild-type six repeats, resulting in reduced expression ofUDP-glucuronosyltransferase 1. Patients who carry two deficient allelesof UGT1A1 exhibit reduced glucuronidation of SN-38. Some case reportshave suggested that individuals who are homozygous for UGT1A1*28 alleles(referred to as having the UGT1A1 7/7 genotype, because both alleles areUGT1A1*28 alleles that contain 7 ta repeats, as opposed to the wild-typeUGT1A1 6/6 genotype in which both alleles contain 6 ta repeats) and whohave fluctuating elevation in serum bilirubin, (e.g., Gilbert's Syndromepatients), may be at greater risk of toxicity upon receiving standarddoses of irinotecan. This suggests that there is a link betweenhomozygosity of the UGT1A1*28 allele, bilirubin levels and irinotecantoxicity.

The metabolic transformation of MM-398 to SN-38 (e.g., in plasma)includes two critical steps: (1) the release of irinotecan from theliposome and (2) the conversion of free irinotecan to SN-38. While notintending to be limited by theory, it is believed that once irinotecanleaves the liposomes, it is catabolized by the same metabolic pathwaysas conventional (free) irinotecan. Therefore the genetic polymorphismsin humans predictive for the toxicity and efficacy of irinotecan andthose of MM-398 can be considered similar. Nonetheless, due to thesmaller tissue distribution, lower clearance, higher systemic exposureand longer elimination half-life of SN-38 of the MM-398 formulationcompared to free irinotecan, the deficient genetic polymorphisms mayshow more association with severe adverse events and/or efficacy.

Patients with Reduced UGT1A1 Activity

Individuals who are homozygous for the UGT1A1*28 allele (UGT1A1 7/7genotype) have been shown to be at increased risk for neutropeniafollowing initiation of irinotecan treatment. According to theprescribing information for irinotecan (Camptosar®), in a study of 66patients who received single-agent irinotecan (350 mg/m2 onceevery-3-weeks), the incidence of grade 4 neutropenia in patientshomozygous for the UGT1A1*28 allele was as high as 50%, and in patientsheterozygous for this allele (UGT1A1 6/7 genotype) the incidence was12.5%. Importantly, no grade 4 neutropenia was observed in patientshomozygous for the wild-type allele (UGT1A1 6/6 genotype). In otherstudies, a lower prevalence of life threatening neutropenia isdescribed. For this reason, patients who are enrolled in the phase 3study described in the Examples herein and are homozygous for theUGT1A1*28 allele (UGT1A1 7/7 genotype) will have MM-398 treatmentinitiated at a lower dose than patients with one (e.g., UGT1A1 6/7) ortwo (UGT1A1 6/6) wild-type alleles.

Additional Genotypic Modifiers of Irinotecan Metabolism

Although the UGT1A1*28 allele is relatively common in Caucasians(estimates 10%), the prevalence is varied in other ethnic groups.Furthermore, additional UGT1A1 genotypes are found with higherprevalence for example in Asian populations and these could be importantfor the metabolism of irinotecan in these populations. For example, theUGT1A1*6 allele is more prevalent in Asians. This allele is notassociated with a to repeat, but with a Gly71Arg mutation that reducesenzyme activity. In previous and ongoing studies of MM-398,pharmacogenetic information has been collected on patients beingenrolled. In a study referred to as the PEP0203 study, the relationshipof genetic polymorphism of UGT1A family and of DPYD (dihydropyrimidinedehydrogenase, an enzyme associated with catabolism of 5-FU) withpharmacokinetic parameters of MM-398 and toxicity did not provide aclear correlation with the small sample size of subjects evaluated.However, it was observed that patients with UGT1A1*6/*28 combinedpolymorphism had higher dose-normalized AUCs of SN-38 and experiencedDLT.

III. 5-Fluorouracil (5-FU) and Leucovorin

5-Fluorouracil is a pyrimidine antagonist that interferes with nucleicacid biosynthesis. The deoxyribonucleotide of the drug inhibitsthymidylate synthetase, thus inhibiting the formation of thymidylic acidfrom deoxyuridylic acid, thus interfering in the synthesis of DNA. Italso interferes with RNA synthesis.

Leucovorin (also called folinic acid) acts as a biochemical cofactor for1-carbon transfer reactions in the synthesis of purines and pyrimidines.Leucovorin does not require the enzyme dihydrofolate reductase (DHFR)for conversion to tetrahydrofolic acid. The effects of methotrexate andother DHFR-antagonists are inhibited by leucovorin. Leucovorin canpotentiate the cytotoxic effects of fluorinated pyrimidines (i.e.,fluorouracil and floxuridine). After 5-FU is activated within the cell,it is accompanied by a folate cofactor, and inhibits the enzymethymidylate synthetase, thus inhibiting pyrimidine synthesis. Leucovorinincreases the folate pool, thereby increasing the binding of folatecofactor and active 5-FU with thymidylate synthetase.

Leucovorin has dextro- and levo-isomers, only the latter one beingpharmacologically useful. As such, the bioactive levo-isomer(“levoleucovorin”) has also been approved by the FDA for treatment ofcancer. The dosage of levoleucovorin is typically half that of theracemic mixture containing both dextro (d) and levo (l) isomers.

FU and leucovorin will be stored and handled according to the countryspecific package inserts.

IV. Administration

Liposomal irinotecan is administered intravenously, either alone or incombination with 5-fluorouracil (5-FU) and/or leucovorin. In oneembodiment, liposomal irinotecan is administered prior to 5-FU andleucovorin. In another embodiment, leucovorin is administered prior to5-FU. In another embodiment, liposomal irinotecan is administeredintravenously over 90 minutes. In another embodiment, 5-FU isadministered intravenously over 46 hours. In another embodiment,leucovorin is administered intravenously over 30 minutes. In variousembodiments the liposomal irinotecan is MM-398.

V. Patient Populations

In one embodiment, a patient treated using the methods and compositionsdisclosed herein exhibits evidence of recurrent or persistent pancreaticcancer following primary chemotherapy.

In another embodiment, the patient has had and failed at least one priorplatinum based chemotherapy regimen for management of primary orrecurrent disease, e.g., a chemotherapy regimen comprising carboplatin,cisplatin, or another organoplatinum compound.

In an additional embodiment, the patient has failed prior treatment withgemcitabine or become resistant to gemcitabine.

In one embodiment a resistant or refractory tumor is one where thetreatment-free interval following completion of a course of therapy fora patient having the tumor is less than 6 months (e.g., owing torecurrence of the cancer) or where there is tumor progression during thecourse of therapy.

In another embodiment, the pancreatic cancer of the patient undergoingtreatment is advanced pancreatic cancer, which is a pancreatic tumorthat exhibits either or both of distant metastasis or peripancreaticextension of the tumor.

The compositions and methods disclosed herein are useful for thetreatment of all pancreatic cancers, including pancreatic cancers thatare refractory or resistant to other anti-cancer treatments.

VI. Combination Therapy

In one embodiment, liposomal irinotecan is co-administered to patientshaving pancreatic cancer in combination with 5-fluorouracil (5-FU) andleucovorin, according to a particular clinical dosage regimen, such asthose described herein. In one embodiment, the liposomal irinotecan isMM-398.

As used herein, adjunctive or combined administration (coadministration)includes simultaneous administration of the compounds in the same ordifferent dosage form, or separate administration of the compounds(e.g., sequential administration). For example, liposomal irinotecan canbe simultaneously administered with 5-FU and leucovorin. Alternatively,liposomal irinotecan can be administered in combination with 5-FU andleucovorin, wherein liposomal irinotecan, 5-FU and leucovorin areformulated for separate administration and are administered concurrentlyor sequentially. For example, liposomal irinotecan can be administeredfirst followed by (e.g., immediately followed by) the administration ofthe 5-FU and leucovorin. Such concurrent or sequential administrationpreferably results in liposomal irinotecan, 5-FU, and leucovorin beingsimultaneously present in treated patients. In a particular embodiment,liposomal irinotecan is administered prior to 5-FU and leucovorin. Inanother particular embodiment, leucovorin is administered prior to 5-FU.

In another embodiment, liposomal irinotecan, 5-FU, and leucovorin areformulated for intravenous administration. In a particular embodiment,the patient is administered an effective amount each of liposomalirinotecan, 5-fluorouracil (5-FU), and leucovorin, wherein the treatmentcomprises at least one cycle, wherein the cycle is a period of 2 weeks,and wherein for each cycle: (a) liposomal irinotecan is administered onday 1 of the cycle at a dose of 80 mg/m², except if the patient ishomozygous for the UGT1A1*28 allele, wherein liposomal irinotecan isadministered on day 1 of cycle 1 at a dose of 60 mg/m²; (b) 5-FU isadministered at a dose of 2400 mg/m²; and (c) leucovorin is administeredat a dose of 200 mg/m² (l form) or 400 mg/m² (l+d racemic form) In aparticular embodiment, the dose of liposomal irinotecan administered tothe patient homozygous for the UGT1A1*28 allele is increased after onecycle to 80 mg/m².

In one embodiment, liposomal irinotecan may be initially administered ata high dose and may be lowered over time. In another embodiment,liposomal irinotecan is initially administered at a low dose andincreased over time. In one embodiment, liposomal irinotecan isadministered as a monotherapy.

In another embodiment, the dose of 5-FU is varied over time. Forexample, 5-FU may be initially administered at a high dose and may belowered over time. In another embodiment, 5-FU is initially administeredat a low dose and increased over time.

In another embodiment, the dose of leucovorin is varied over time. Forexample, leucovorin may be initially administered at a high dose and maybe lowered over time. In another embodiment, leucovorin is initiallyadministered at a low dose and increased over time.

VII. Treatment Protocols

Suitable treatment protocols include, for example, those wherein thepatient is administered an effective amount of liposomal irinotecan,wherein the treatment comprises at least one cycle, wherein the cycle isa period of 3 weeks, and wherein for each cycle the liposomal irinotecanis administered on day 1 of the cycle at a dose of 120 mg/m², except ifthe patient is homozygous for the UGT1A1*28 allele, wherein liposomalirinotecan is administered on day 1 of cycle 1 at a dose of 80 mg/m². Inone embodiment, the dose of liposomal irinotecan administered to thepatient homozygous for the UGT1A1*28 allele is increased after one cyclein increments of 20 mg/m², up to a maximum of 120 mg/m².

In another embodiment, the treatment protocol includes administering tothe patient an effective amount each of liposomal irinotecan,5-fluorouracil (5-FU), and leucovorin, wherein the treatment comprisesat least one cycle, wherein the cycle is a period of 2 weeks, andwherein for each cycle: (a) liposomal irinotecan is administered on day1 of the cycle at a dose of 80 mg/m², except if the patient ishomozygous for the UGT1A1*28 allele, wherein liposomal irinotecan isadministered on day 1 of cycle 1 at a dose of 60 mg/m²; (b) 5-FU isadministered at a dose of 2400 mg/m²; and (c) leucovorin is administeredat a dose of 200 mg/m² (l form) or 400 mg/m² (l+d racemic form). In aparticular embodiment, the dose of liposomal irinotecan administered tothe patient homozygous for the UGT1A1*28 allele is increased after onecycle to 80 mg/m².

VIII. Outcomes

Provided herein are methods for treating pancreatic cancer in a patientcomprising administering to the patient liposomal irinotecan (MM-398),alone or in combination with 5-fluorouracil (5-FU) and leucovorin,according to a particular clinical dosage regimen.

Preferably, the combination therapy with liposomal irinotecan with 5-FUand leucovorin exhibits therapeutic synergy.

“Therapeutic synergy” refers to a phenomenon where treatment of patientswith a combination of therapeutic agents manifests a therapeuticallysuperior outcome to the outcome achieved by each individual constituentof the combination used at its optimum dose (T. H. Corbett et al., 1982,Cancer Treatment Reports, 66, 1187). In this context a therapeuticallysuperior outcome is one in which the patients either a) exhibit fewerincidences of adverse events while receiving a therapeutic benefit thatis equal to or greater than that where individual constituents of thecombination are each administered as monotherapy at the same dose as inthe combination, or b) do not exhibit dose-limiting toxicities whilereceiving a therapeutic benefit that is greater than that of treatmentwith each individual constituent of the combination when eachconstituent is administered in at the same doses in the combination(s)as is administered as individual components. In xenograft models, acombination, used at its maximum tolerated dose, in which each of theconstituents will be present at a dose generally not exceeding itsindividual maximum tolerated dose, manifests therapeutic synergy whendecrease in tumor growth achieved by administration of the combinationis greater than the value of the decrease in tumor growth of the bestconstituent when the constituent is administered alone.

Thus, in combination, the components of such combinations have anadditive or superadditive effect on suppressing pancreatic tumor growth,as compared to monotherapy with liposome-encapsulated irinotecan aloneor treatment with the chemotherapeutic(s) in the absence of liposomalirinotecan therapy. By “additive” is meant a result that is greater inextent (e.g., in the degree of reduction of tumor mitotic index or oftumor growth or in the degree of tumor shrinkage or the frequency and/orduration of symptom-free or symptom-reduced periods) than the bestseparate result achieved by monotherapy with each individual component,while “superadditive” is used to indicate a result that exceeds inextent the sum of such separate results. In one embodiment, the additiveeffect is measured as slowing or stopping of pancreatic tumor growth.The additive effect can also be measured as, e.g., reduction in size ofa pancreatic tumor, reduction of tumor mitotic index, reduction innumber of metastatic lesions over time, increase in overall responserate, or increase in median or overall survival.

One non-limiting example of a measure by which effectiveness of atherapeutic treatment can be quantified is by calculating the log 10cell kill, which is determined according to the following equation:log 10 cell kill=TC (days)/3.32×Td

in which T C represents the delay in growth of the cells, which is theaverage time, in days, for the tumors of the treated group (T) and thetumors of the control group (C) to have reached a predetermined value (1g, or 10 mL, for example), and Td represents the time, in days necessaryfor the volume of the tumor to double in the control animals. Whenapplying this measure, a product is considered to be active if log 10cell kill is greater than or equal to 0.7 and a product is considered tobe very active if log 10 cell kill is greater than 2.8. Using thismeasure, a combination, used at its own maximum tolerated dose, in whicheach of the constituents is present at a dose generally less than orequal to its maximum tolerated dose, exhibits therapeutic synergy whenthe log 10 cell kill is greater than the value of the log 10 cell killof the best constituent when it is administered alone. In an exemplarycase, the log 10 cell kill of the combination exceeds the value of thelog 10 cell kill of the best constituent of the combination by at least0.1 log cell kill, at least 0.5 log cell kill, or at least 1.0 log cellkill.

Responses to therapy may include:

Pathologic complete response (pCR): absence of invasive cancer in thebreast and lymph nodes following primary systemic treatment.

Complete Response (CR): Disappearance of all target lesions. Anypathological lymph nodes (whether target or non-target) which hasreduction in short axis to <10 mm;

Partial Response (PR): At least a 30% decrease in the sum of dimensionsof target lesions, taking as reference the baseline sum diameters;

Stable Disease (SD): Neither sufficient shrinkage to qualify for partialresponse, nor sufficient increase to qualify for progressive disease,taking as reference the smallest sum diameters while on study; or

Meanwhile, non-CR/Non-PD denotes a persistence of one or more non-targetlesion(s) and/or maintenance of tumor marker level above the normallimits.

Progressive Disease (PD) denotes at least a 20% increase in the sum ofdimensions of target lesions, taking as reference the smallest sum onstudy (this includes the baseline sum if that is the smallest on study).In addition to the relative increase of 20%, the sum must alsodemonstrate an absolute increase of 5 mm. The appearance of one or morenew lesions is also considered progression.

In exemplary outcomes, patients treated according to the methodsdisclosed herein may experience improvement in at least one sign ofpancreatic cancer.

In one embodiment the patient so treated exhibits pCR, CR, PR, or SD.

In another embodiment, the patient so treated experiences tumorshrinkage and/or decrease in growth rate, i.e., suppression of tumorgrowth. In another embodiment, unwanted cell proliferation is reduced orinhibited. In yet another embodiment, one or more of the following canoccur: the number of cancer cells can be reduced; tumor size can bereduced; cancer cell infiltration into peripheral organs can beinhibited, retarded, slowed, or stopped; tumor metastasis can be slowedor inhibited; tumor growth can be inhibited; recurrence of tumor can beprevented or delayed; one or more of the symptoms associated with cancercan be relieved to some extent.

In other embodiments, such improvement is measured by a reduction in thequantity and/or size of measurable tumor lesions. Measurable lesions aredefined as those that can be accurately measured in at least onedimension (longest diameter is to be recorded) as ≧10 mm by CT scan (CTscan slice thickness no greater than 5 mm), 10 mm caliper measurement byclinical exam or >20 mm by chest X-ray. The size of non-target lesions,e.g., pathological lymph nodes can also be measured for improvement. Inone embodiment, lesions can be measured on chest x-rays or CT or MRIfilms.

In other embodiments, cytology or histology can be used to evaluateresponsiveness to a therapy. The cytological confirmation of theneoplastic origin of any effusion that appears or worsens duringtreatment when the measurable tumor has met criteria for response orstable disease can be considered to differentiate between response orstable disease (an effusion may be a side effect of the treatment) andprogressive disease.

In some embodiments, administration of effective amounts of liposomalirinotecan, 5-FU and leucovorin according to any of the methods providedherein produce at least one therapeutic effect selected from the groupconsisting of reduction in size of a breast tumor, reduction in numberof metastatic lesions appearing over time, complete remission, partialremission, stable disease, increase in overall response rate, or apathologic complete response. In some embodiments, the provided methodsof treatment produce a comparable clinical benefit rate (CBR=CR+PR+SD≧6months) better than that achieved by the same combinations ofanti-cancer agents administered without concomitant MM-398administration. In other embodiments, the improvement of clinicalbenefit rate is about 20% 20%, 30%, 40%, 50%, 60%, 70%, 80% or morecompared to the same combinations of anti-cancer agents administeredwithout concomitant MM-398 administration.

The following examples are illustrative and should not be construed aslimiting the scope of this disclosure in any way; many variations andequivalents will become apparent to those skilled in the art uponreading the present disclosure.

EXAMPLES Example 1 Activity of MM-398 in an Orthotopic Pancreas TumorModel Expressing Luciferase (L3.6pl)

The anti-tumor activity of MM-398 was assessed in an orthotopicpancreatic cancer model (L3.6pl), a highly hypoxic preclinical tumormodel. Approximately 2.5×10⁻⁵ L3.6pl pancreatic tumor cells wereimplanted by direct injection into the pancreas. The bioluminescenceimages (BLI) were followed over time for tumor burdendetection/quantitation. MM-398 and free irinotecan were dosed at a doseof 20 mg/kg/dose weekly for three weeks. As shown in FIG. 1, MM-398(liposomal CPT11) had significant anti-tumor activity, as compared to acontrol (HBS) and free CPT11.

Example 2 Accumulation of SN-38 in Tumors Following Treatment with FreeIrinotecan or Liposomal Irinotecan (MM-398)

It was hypothesized that the anti-tumor activity observed in theorthotopic pancreatic cancer model is due to the effect of macrophagesin converting irinotecan to the more active SN-38 locally. To test thishypothesis, human colon cancer cells (HT-29) were injectedsubcutaneously into SCID mice, 40 mg/kg of free irinotecan or MM-398 wasinjected intravenously when the tumors reached 1000 mm³ in size.Tumor-bearing mice were sacrificed at different time points, tumors fromboth groups were extracted and the concentrations of SN-38 weremeasured.

As shown in FIG. 2, there was a 20-fold increase in the tumorAUC_(SN-38) for MM-398 as compared to free irinotecan. The long durationof exposure allows for prolonged exposure of the slow proliferatingcancer cells to the active metabolite as they progress through the cellcycle. In addition, this activity was also hypothesized to result from areduction in intra-tumoral hypoxia, and the subsequent downstreameffects on angiogenesis, metastasis, and the immunosuppressiveenvironment in tumors.

Example 3 Effect of MM-398 on Carbonic Anhydrase IX Staining in a HT29Xenograft Model

To test whether MM-398 reduces markers of hypoxia, experiments wereconducted in a human colon cancer cell (HT-29) model. Specifically,HT-29 cells were injected subcutaneously into nude mice, on day 13either PBS control or 1.25, 2.5, 5, 10 or 20 mg/kg MM-398 was injectedintravenously. MM-398 was dosed once a week for 4 weeks at the indicateddoses. Tumors from both groups (n=5) were extracted 24 hours after thelast dose. Frozen tumor sections were used for immunohistochemicalstaining of Carbonic Anhydrase IX (CAIX). Quantification of CAIXstaining was performed using Definiens® (Definiens AG, Munich) software.

As shown in FIG. 3, MM-398 reduced markers of hypoxia. Specifically, thegraphs in FIG. 3 show the percentage of cells that stained with medium(middle third) or high (top third) intensity for CAIX. Representativesamples from each group are shown as well as the group average(mean+/−stdev). MM-398 treatment modifies the tumor microenvironment bydecreasing the percentage of both medium and high CAIX positive cells ina dose-dependent manner. As hypoxia is a hallmark of resistant andaggressive disease, a reduction in hypoxia is expected to make tumorcells more sensitive to chemotherapies.

Example 4 MM-398 Increases Perfusion of Hoechst Stain

In addition to changing the chemosensitivity of tumor cells throughmodification of the tumor microenvironment, lowering hypoxia canindicate improved tumor vascularization, which can facilitate deliveryof small molecule therapies. MM-398 treatment led to increasedmicrovessel density 6 days after treatment as measured by CD31 (plateletendothelial cell adhesion molecule) staining in an HT29 xenograft study.To further assess the effect of MM-398 on small molecule tumorvascularization, a Hoechst 33342 perfusion experiment was conducted.Specifically, a primary pancreatic tumor was grown in NOD-SCID mice andgiven one dose of MM-398 (20 mg/kg). After 24 hours, Hoechst 33342 stainwas administered 20 minutes prior to sacrificing the animal. As shown inFIG. 4, the increase in stain intensity in treated mice wasstatistically significant, p<0.001. These data indicate that MM-398modifies the tumor microenvironment in a manner that should make tumorsmore susceptible to agents such as 5-FU/LV, through decreasing tumorhypoxia and increasing small molecule perfusion.

Example 5 MM-398 Pharmacokinetics in Humans (Phase I)

The pharmacokinetic profile of MM-398 single agent was investigated in aphase I clinical study (PEP0201) in patients at 60, 120 or 180 mg/m²dose levels and in a phase II clinical trial in gastric cancer patients(PEP0206) at 120 mg/m². Plasma levels of total irinotecan, SN-38 andencapsulated irinotecan were measured in these studies.

The peak serum concentrations of total irinotecan (C_(max)) ranged from48-79 μg/ml for 120 mg/m² of MM-398, which was approximately 50 foldhigher than 125 mg/m² free irinotecan. The total irinotecan half-life(t_(1/2)) for MM-398 ranged from 21 to 48 hours, which was approximately2-3 fold higher than 125 mg/m² of free irinotecan. Overall, totalirinotecan exposure at one week (AUC 0-T) ranged from 1200-3000(μg*h/ml) at a dose of 120 mg/m² of MM-398, approximately 50-100 foldhigher than 300 mg/m² of free irinotecan. In contrast, SN38 C_(max)levels at 120 mg/m² of MM-398 ranged from 9 to 17 ng/ml, which wasapproximately 50% less than free irinotecan at 125 mg/m². Overall,exposure of SN38 at one week (AUC 0-T) ranged from 474 to 997 ng*/ml andwas only 1-2 fold higher than achieved by free irinotecan at 300 mg/m².For both SN38 and total irinotecan, AUC increased less thanproportionally with dose of MM-398. The PK parameters of encapsulatedirinotecan almost matched that of total irinotecan indicates that mostof irinotecan remained encapsulated in the liposomes during circulation.The MM-398 PK parameters were not significantly changed when combinedwith 5-FU/LV. FIGS. 5 and 6 summarize the PK findings in previousstudies of MM 398.

Example 6 Phase 1 Dose Escalation Study

A regimen combining fluorouracil, leucovorin, and MM-398 was studied ina phase 1 trial of solid tumors in 16 subjects, of whom 5 were patientswith pancreatic cancer. The objective tumor response rate, duration ofresponse, and disease control rate were efficacy endpoints of the study.Among the 15 efficacy-evaluable patients, 2 (13.3%) had confirmed PR, 9(60.0%) had SD, and 4 (26.7%) had PD. The overall disease control ratewas 73.3%. Partial response was observed in one gastric cancer patient(at 80 mg/m² dose level) and one breast cancer patient (at 100 mg/m2dose level), with the duration of response of 142 and 76 days,respectively. Among the 6 patients who received the MTD dose of 80mg/m², there were 1 PR, 4 SD and 1 PD. The tumor response rate anddisease control rate were 16.7% and 83.3%, respectively. The main DLTswere grade 3 diarrhea, leucopenia, neutropenia and febrile neutropenia.The MTD for MM-398 was 80 mg/m².

In the phase 1 dose-escalation study of MM-398 in combination with5-FU/LV in advanced solid tumors (PEP0203), a total of 401 episodes ofAE were reported from the 16 treated subjects (safety population), ofwhich 74 (18.4%) were of CTC grade 3 or above. Among all AEs, 231(57.6%) were considered by the investigators to be treatment-related.The most common treatment-related AEs, included nausea (81.3%), diarrhea(75.0%), vomiting (68.8%), fatigue (43.8%), mucositis (43.8%),leucopenia (37.5%), neutropenia (37.5%), weight loss (37.5%), anemia(31.3%), and alopecia (31.3%). Acute cholinergic diarrhea was rarelyobserved. Table 1 provides the incidence of treatment-emergent adverseevents by maximum CTC grade and by causality (incidence 20%), as seen inthe PEP0203 study. Table 2 provides the incidence of grade 3 or highertreatment-emergent adverse events seen in the 5 pancreatic cancerpatients treated in the PEP0203 study.

TABLE 1 Incidence of treatment-emergent adverse events by maximum CTCgrade and by causality (incidence ≧ 20%) in the PEP0203 Study Systemorgan class Total Severity (Grade)¹ Causality² Preferred Term (N = 16) III III IV Yes No Blood and lymphatic system disorders Anemia 7 (43.8%) 32 2 0 5 2 Leucopenia 6 (37.5%) 0 3 2 1 6 0 Neutropenia 6 (37.5%) 0 2 3 16 0 Gastrointestinal disorders Abdominal pain 7 (43.8%) 3 2 2 0 3 4Constipation 6 (37.5%) 3 3 0 0 0 6 Diarrhea 12 (75.0%) 3 4 5 0 12 0Nausea 13 (81.3%) 6 6 1 0 13 0 Vomiting 12 (75.0%) 3 8 1 0 11 1 Generaldisorders and administration site conditions Fatigue 8 (50.0%) 4 3 1 0 71 Mucosal inflammation 7 (43.8%) 4 3 0 0 7 0 Pyrexia 7 (43.8%) 3 4 0 0 25 Infections and infestations Infection 6 (37.5%) 0 3 3 0 2 4Investigations ALT increased 5 (31.3%) 3 2 0 0 4 1 AST increased 4(25.0%) 3 1 0 0 1 3 Weight decreased 8 (50.0%) 4 4 0 0 6 2 Metabolismand nutrition disorders Anorexia 4 (25.0%) 1 2 1 0 3 1 Hypoalbuminaemia4 (25.0%) 0 3 1 0 0 4 Hypocalcaemia 5 (31.3%) 1 4 0 0 0 5 Hypokalaemia 8(50.0%) 2 0 5 1 2 6 Hyponatraemia 4 (25.0%) 2 0 0 2 0 4 Nervous systemdisorders Dizziness 4 (25.0%) 4 0 0 0 1 3 Psychiatric disorders Insomnia4 (25.0%) 4 0 0 0 1 3 Respiratory, thoracic and mediastinal disordersCough 5 (31.3%) 3 1 1 0 0 5 Skin and subcutaneous tissue disordersAlopecia 5 (31.3%) 5 0 0 0 5 0 ¹Severity grading used the highestgrading ever rated for each subject if the subject had such adverseevent reported ²Defined as subject ever experienced AE related to thestudy drug in causality or not

TABLE 2 Incidence of Grade 3 or higher treatment-emergent adverse eventsin pancreatic cancer patients in the PEP0203 Study 60 80 120 Overallmg/m2 mg/m2 mg/m2 Primary system organ class N = 5 N = 1 N = 3 N = 1Preferred term n (%) n (%) n (%) n (%) Any primary system organ classTotal 3 (60.0) 0 2 (66.7) 1 (100.0) Infections and infestations Total 3(60.0) 0 2 (66.7) 1 (100.0) Hepatitis viral 1 (20.0) 0 1 (33.3) 0Infection 1 (20.0) 0 0 1 (100.0) Pneumonia 1 (20.0) 0 1 (33.3) 0 Septicshock 1 (20.0) 0 1 (33.3) 0 Blood and lymphatic system disorders Total 2(40.0) 0 1 (33.3) 1 (100.0) Lymphopenia 1 (20.0) 0 0 1 (100.0)Neutropenia 1 (20.0) 0 1 (33.3) 0 White blood cell disorder 1 (20.0) 0 01 (100.0) Gastrointestinal disorders Total 2 (40.0) 0 1 (33.3) 1 (100.0)Diarrhoea 2 (40.0) 0 1 (33.3) 1 (100.0) Abdominal pain 1 (20.0) 0 0 1(100.0) Gastrointestinal haemorrhage 1 (20.0) 0 1 (33.3) 0Investigations Total 2 (40.0) 0 1 (33.3) 1 (100.0) Blood bilirubinincreased 1 (20.0) 0 1 (33.3) 0 Lipase increased 1 (20.0) 0 0 1 (100.0)Neutrophil count decreased 1 (20.0) 0 0 1 (100.0) White blood cell count1 (20.0) 0 0 1 (100.0) decreased Metabolism and nutrition disordersTotal 2 (40.0) 0 1 (33.3) 1 (100.0) Hypoalbuminaemia 1 (20.0) 0 1 (33.3)0 Hypokalaemia 1 (20.0) 0 1 (33.3) 0 Hyponatraemia 1 (20.0) 0 0 1(100.0) Hypophosphataemia 1 (20.0) 0 0 1 (100.0) Respiratory, thoracicand mediastinal disorders Total 2 (40.0) 0 1 (33.3) 1 (100.0) Dyspnoea 1(20.0) 0 0 1 (100.0) Pleural effusion 1 (20.0) 0 1 (33.3) 0 Generaldisorders and administration site conditions Total 1 (20.0) 0 0 1(100.0) Death 1 (20.0) 0 0 1 (100.0)

Example 7 Phase 3 Trial

The promising efficacy and safety data from the Phase 1 Trial (describedabove) warrant the MM-398 and 5-FU plus leucovorin combination to beexplored further in a phase 3 study.

A. Objectives

The primary objective of the Phase 3 trial is to compare overallsurvival following treatment with MM-398, with or without 5-fluorouracilplus leucovorin, versus 5-fluorouracil and leucovorin in patients withmetastatic pancreatic cancer that have progressed on gemcitabine basedtherapy. The secondary objectives includes the following:

To compare time-to-event efficacy endpoints between the experimental andcontrol arms (i.e., Progression-free survival (PFS) and Time totreatment failure (TTF));

-   -   To compare the Objective Response Rate (ORR) between the        treatment arms;    -   To compare the tumor marker response of CA 19-9 between the        treatment arms;    -   To compare the Clinical Benefit Response (CBR) rate between the        treatment arms;    -   To assess patient-reported outcomes (PROs) between the treatment        arms using the European Organization for Research and Treatment        of Cancer (EORTC) quality-of-life core questionnaire        (EORTC-QLQ-C30);    -   To compare the safety and adverse event profile between the        treatment arms; and    -   To determine the pharmacokinetic properties of MM-398, as a        single agent and in combination with 5-FU and leucovorin.

A key exploratory objective of this study is to explore biomarkersassociated with toxicity and efficacy following treatment with MM-398and MM-398 plus 5-FU and leucovorin.

B. Study Design

This is an open label, randomized, three arm, Phase 3 trial of MM-398,with or without 5-FU and leucovorin, versus 5-fluorouracil (5-FU) andleucovorin (also known as folinic acid), in metastatic pancreatic cancerpatients who have progressed on prior gemcitabine based therapy.

Approximately 405 eligible patients will be enrolled in this globalstudy, under the protocol version 2 or later. All patients willparticipate in up to 28 days of screening, during which they will beassessed for eligibility and screened for the UGT1A1*28 allele. Eligiblepatients will be randomized, in a 1:1:1 ratio, to one of the followingtreatment arms:

Arm A MM 398 120 mg/m2 IV over 90 minutes, every 3 (experimental weeks.Patients who are homozygous for UGT1A1*28 arm): MM-398 allele willreceive the first cycle of therapy at a reduced dose of 80 mg/m². If thepatient does not experience any drug related toxicity after the firstadministration of MM-398, from cycle 2 onwards, the dose may beincreased in increments of 20 mg/m² up to a maximum of 120 mg/m². Arm B5-FU 2000 mg/m² IV over 24-hours (+/−30 minutes), (control arm):administered weekly for 4 weeks (days 1, 8, 15 and 22), 5-FU andfollowed by 2 weeks of rest, in a 6 weekly cycle. leucovorinLevoleucovorin dosed at 200 mg/m² or the leucovorin l + d racemicmixture dosed at 400 mg/m², given IV over 30 minutes, administeredweekly for 4 weeks (days 1, 8, 15 and 22), followed by 2 weeks of rest,in a 6 weekly cycle. Arm C MM-398 80 mg/m² IV over 90 minutes, every 2weeks. (experimental Patients who are homozygous for UGT1A1*28 alleleand arm): MM-398, are randomized to Arm C, will receive the first cycleof 5-FU and therapy at a reduced dose of 60 mg/m². If the patientleucovorin does not experience any drug related toxicity after the firstadministration of MM-398, from cycle 2 onwards, the dose may beincreased to 80 mg/m². 5-FU 2400 mg/m² IV over 46-hours, every 2 weeks.Levoleucovorin dosed at 200 mg/m² or the l + d racemic mixture dosed at400 mg/m², IV over 30 minutes, every 2 weeks. MM-398 should beadministered prior to 5-FU and leucovorin; leucovorin should always beadministered prior to 5-FU. If the dosing of either MM-398 or 5-FU/leucovorin needs to be withheld, then the other drug in thecombination should not be administered either.

Patients will be evenly randomized to the treatment arms using anInteractive Web Response System (IWRS) at a central location. Therandomization will be stratified based on the following prognosticfactors:

-   -   Baseline albumin levels (≧4.0 g/dL vs <4.0 g/dL)    -   KPS (70 and 80 vs ≧90)    -   Ethnicity (Caucasian vs East Asian vs All Others)

Therapy will be administered in cycles. Patients will be treated untildisease progression (radiologic or clinical deterioration), intolerabletoxicity or other reasons for study termination. Tumor responses will beassessed, using the RECIST guidelines (Eisenhauer, E. A., et al., “Newresponse evaluation criteria in solid tumors: Revised RECIST guideline(version 1.1). European Journal of Cancer, 2009. 45:pp. 228-247) every 6weeks or sooner if disease progression based on clinical signs andsymptoms is evident. Tumor measurement images will be collected andstored on all patients throughout the study. However, all treatmentdecisions will be based on the local radiologist and/or PI assessment ofdisease status. An independent review of the scans may be performed inthe event that an independent analysis of ORR and/or PFS is necessary.

Following treatment discontinuation a 30-day post therapy follow upvisit is required. Subsequently, all patients will be followed-up every1 month for overall survival (by phone or visit to the study site) untildeath or study closure, whichever occurs first. Patients, who withdrawfrom study treatment due to reasons other than objective diseaseprogression, should continue to be assessed every 6 weeks during thefollow-up period for radiologic progression (including patients whodiscontinue due to symptomatic deterioration).

All patients will be asked to complete a pain assessment and analgesicconsumption diary throughout their participation in the study, whichwill document the patient's assessment of their pain intensity and dailyanalgesic consumption. Patient responses will be used for assessment ofthe clinical benefit response along with the other parameters. Allpatients will also be required to complete the EORTC-QLQ-C30questionnaire for assessing quality of life.

In order to address the exploratory objectives of this study, all siteswill be required to participate in the companion translational research(TR) protocol (MM-398-07-03-01.TR), unless prohibited by localregulations. Participation is this study will be optional for patientsand they will be required to provide a separate consent for thetranslational research.

The primary analysis of OS will take place once at least 305 deathsevents have occurred in patients enrolled under protocol version 2 orlater. Patients receiving study treatment at the time of primaryanalysis for OS will continue to receive treatment until one of thecriteria for discontinuation is met. During the course of the study,regular review of safety data will be conducted by an independent datasafety monitoring board (DSMB). FIG. 7 illustrates the study design.

C. Patient Selection and Discontinuation

Approximately 405 patients will be enrolled globally in this study,under the protocol version 2 or later. In order to be included in thestudy, patients must have/be:

-   -   1. Histologically or cytologically confirmed adenocarcinoma of        exocrine pancreas    -   2. Documented metastatic disease; disease status may be        measurable or non-measurable as defined by RECIST v1.1        guidelines    -   3. Documented disease progression after prior gemcitabine or        gemcitabine containing therapy, in locally advanced or        metastatic setting. Examples of permitted therapies include, but        are not limited to:        -   Single agent gemcitabine        -   Any one gemcitabine-based regimen, with or without            maintenance gemcitabine        -   Single agent gemcitabine to which a platinum agent, a            fluoropyrimidine, or erlotinib was subsequently added        -   Gemcitabine administered in the adjuvant setting if disease            recurrence occurred within 6 months of completing the            adjuvant therapy    -   4. Karnofsky Performance Status (KPS)≧70    -   5. Adequate bone marrow reserves as evidenced by:        -   ANC>1,500 cells/0 without the use of hematopoietic growth            factors; and        -   Platelet count>100,000 cells/μl; and        -   Hemoglobin>9 g/dL (blood transfusions are permitted for            patients with hemoglobin levels below 9 g/dL)    -   6. Adequate hepatic function as evidenced by:        -   Serum total bilirubin within normal range for the            institution (biliary drainage is allowed for biliary            obstruction)        -   Albumin levels≧3.0 g/dL        -   Aspartate aminotransferase (AST) and alanine            aminotransferase (ALT)≦2.5×ULN (≦5×ULN is acceptable if            liver metastases are present)    -   7. Adequate renal function as evidenced by a serum        creatinine≦1.5×ULN    -   8. Normal ECG or ECG without any clinically significant findings    -   9. Recovered from the effects of any prior surgery, radiotherapy        or other anti-neoplastic therapy    -   10. At least 18 years of age    -   11. Able to understand and sign an informed consent (or have a        legal representative who is able to do so)

Patients must meet all the inclusion criteria listed above and none ofthe following exclusion criteria:

-   -   1. Active CNS metastases (indicated by clinical symptoms,        cerebral edema, steroid requirement, or progressive disease)    -   2. Clinically significant gastrointestinal disorder including        hepatic disorders, bleeding, inflammation, occlusion, or        diarrhea>grade 1    -   3. History of any second malignancy in the last 5 years;        subjects with prior history of in-situ cancer or basal or        squamous cell skin cancer are eligible. Subjects with other        malignancies are eligible if they have been continuously disease        free for at least 5 years.    -   4. Severe arterial thromboembolic events (myocardial infarction,        unstable angina pectoris, stroke) less than 6 months before        inclusion    -   5. NYHA Class III or IV congestive heart failure, ventricular        arrhythmias or uncontrolled blood pressure    -   6. Active infection or an unexplained fever>38.5° C. during        screening visits or on the first scheduled day of dosing (at the        discretion of the investigator, patients with tumor fever may be        enrolled), which in the investigator's opinion might compromise        the patient's participation in the trial or affect the study        outcome    -   7. Known hypersensitivity to any of the components of MM-398,        other liposomal products, fluropyrimidines or leucovorin    -   8. Investigational therapy administered within 4 weeks, or        within a time interval less than at least 5 half-lives of the        investigational agent, whichever is longer, prior to the first        scheduled day of dosing in this study    -   9. Any other medical or social condition deemed by the        Investigator to be likely to interfere with a patient's ability        to sign informed consent, cooperate and participate in the        study, or interfere with the interpretation of the results    -   10. Pregnant or breast feeding; females of child-bearing        potential must test negative for pregnancy at the time of        enrollment based on a urine or serum pregnancy test. Both male        and female patients of reproductive potential must agree to use        a reliable method of birth control, during the study and for 3        months following the last dose of study drug.

The criteria for enrollment must be followed explicitly. Patients willbe discontinued from the study treatment in the following circumstances:

-   -   Patient has evidence of disease progression based on RECIST v1.1        criteria    -   Patient shows symptomatic deterioration    -   Patient experiences intolerable toxicity, or an adverse event        which requires:        -   A third dose reduction        -   Treatment to be withheld for more than 21 days from the            start of next cycle, unless, in the opinion of the            investigator, the patient is receiving benefit from study            treatment    -   Patient is significantly non-compliant with study procedures per        PI assessment    -   The patient or patient's attending physician requests that the        patient be withdrawn from the study treatment    -   The investigator or Sponsor, for any reason, but considering the        rights, safety and well-being of the patient(s) and in        accordance with ICH/GCP Guidelines and local regulations, stops        the study or stops the patient's participation in the study

If a patient is lost to follow-up or withdraws from study treatment,attempts should be made to contact the patient to determine the reasonfor discontinuation. For patients who are lost to follow-up, at least 3documented attempts, including one via certified mail, should be made tocontact the patient before considering the patient lost to follow-up. Ifa patient discontinues study treatment due to reasons other thanobjective disease progression, the patient should continue to haveradiological disease assessment every 6 weeks until objective diseaseprogression is observed.

All patients who discontinue study treatment should continue to befollowed-up as required by the protocol. The only circumstance underwhich a patient should not be followed for study endpoints is when thepatient has withdrawn consent. Withdrawal of consent should be a patientinitiated decision and should mean, not only that the patient wishes todiscontinue study treatment and follow-up visits but also that theinvestigator is no longer authorized to make further efforts to contactthe patient, including any efforts to identify their survival status.

D. Method of Assigning Patients to Treatment Groups

After all screening assessments have been completed and UGT1A1*28results are available, patients will be randomized using a computerizedinteractive web response system ((IWRS), in a 1:1:1 ratio, to one of thefollowing treatment arms:

-   -   Arm A (experimental arm): MM-398    -   Arm B (control arm): 5-FU and leucovorin    -   Arm C (experimental arm): MM-398, 5-FU and leucovorin

Randomization must occur within 7 days of planned dosing. Therandomization will be stratified based on the following prognosticfactors:

-   -   Baseline albumin levels (≧4.0 g/dL vs <4.0 g/dL)    -   KPS (70 and 80 vs ≧90)    -   Ethnicity (Caucasian vs East Asian vs All Others)

E. Description of MM-398

MM-398 is irinotecan (also known as CPT-11) encapsulated in a liposomaldrug delivery system. It will be supplied as sterile, single-use vialscontaining 9.5 mL of MM-398 at a concentration of 5 mg/mL. The vialscontain a 0.5 mL excess to facilitate the withdrawal of the label amountfrom each 10 mL vial.

MM-398 must be stored refrigerated at 2 to 8° C., with protection fromlight. Light protection is not required during infusion. MM-398 must notbe frozen. Responsible individuals should inspect vial contents forparticulate matter before and after they withdraw the drug product froma vial into a syringe.

MM-398 must be diluted prior to administration. The diluted solution isphysically and chemically stable for 6 hours at room temperature (15-30°C.), but it is preferred to be stored at refrigerated temperatures (2-8°C.), and protected from light. The diluted solution must not be frozen.Because of possible microbial contamination during dilution, it isadvisable to use the diluted solution within 24 hours if refrigerated(2-8° C.), and within 6 hours if kept at room temperature (15-30° C.).

Twenty vials of MM-398 will be packaged in a cardboard container. Theindividual vials, as well as the outside of the cardboard container,will be labeled in accordance with local regulatory requirements.

MM-398 will be dosed and administered as follows. All patients will bescreened for UGT1A1*28 allele at baseline.

Arm A Patients who do not have the homozygous allele for UGT1A1*28 willreceive MM-398 at a dose of 120 mg/m². Any patient who is homozygous forUGT1A1*28 will receive the first cycle of therapy at a reduced dose of80 mg/m². If the patient does not experience any drug related toxicityafter the first administration of MM-398, from cycle 2 onwards, theirdose can be increased in increments of 20 mg/m², up to a maximum of 120mg/m². Arm C Patients who do not have the homozygous allele forUGT1A1*28 will receive MM-398 at a dose of 80 mg/m². Patients who arehomozygous for UGT1A1*28 allele and are randomized to Arm C, willreceive the first cycle of therapy at a reduced dose of 60 mg/m². If thepatient does not experience any drug related toxicity after the firstadministration of MM- 398, from cycle 2 onwards, the dose may beincreased to 80 mg/m². MM-398 should be administered prior to 5-FU andleucovorin administration.

In Arm A, MM-398 will be administered by IV infusion over 90 minutes onthe first day of each 3 week cycle, at the investigational site. In ArmC, MM-398 will be administered by an IV infusion over 90 minutes for thefirst cycle; the infusion time could be reduced to 60 minutes from cycle2 onwards, if no acute infusion reaction has occurred in cycle 1. Cycleduration is 3 weeks for Arm A and 2 weeks for Arm C. The first cycle Day1 is a fixed day; subsequent doses should be administered on the firstday of each cycle+/−3 days.

Prior to administration, the appropriate dose of MM-398 must be dilutedin 5% Dextrose Injection solution (D5W) to a final volume of 500 mL.Care should be taken not to use in-line filters or any diluents otherthan D5W. MM-398 can be administered using standard PVC-containingintravenous administration bags and tubing.

The actual dose of MM-398 to be administered will be determined bycalculating the patient's body surface area at the beginning of eachcycle. A +/−5% variance in the calculated total dose will be allowed forease of dose administration. Since MM-398 vials are single-use vials,site staff must not store any unused portion of a vial for future useand they must discard unused portions of the product.

All patients must be premedicated prior to MM-398 infusion with standarddoses of dexamethasone and a 5-HT3 antagonist or other anti-emetics asper standard institutional practices for irinotecan administration.Atropine may be prescribed prophylactically for patients who experiencedacute cholinergic symptoms in the previous cycles.

F. Description of 5-FU and Leucovorin

5-Fluorouracil is a pyrimidine antagonist that interferes with nucleicacid biosynthesis. The deoxyribonucleotide of the drug inhibitsthymidylate synthetase, thus inhibiting the formation of thymidylic acidfrom deoxyuridylic acid, thus interfering in the synthesis of DNA. Italso interferes with RNA synthesis.

Leucovorin acts as a biochemical cofactor for 1-carbon transferreactions in the synthesis of purines and pyrimidines. Leucovorin doesnot require the enzyme dihydrofolate reductase (DHFR) for conversion totetrahydrofolic acid. The effects of methotrexate and otherDHFR-antagonists are inhibited by leucovorin. Leucovorin can potentiatethe cytotoxic effects of fluorinated pyrimidines (i.e., fluorouracil andfloxuridine). After 5-FU is activated within the cell, it is accompaniedby a folate cofactor, and inhibits the enzyme thymidylate synthetase,thus inhibiting pyrimidine synthesis. Leucovorin increases the folatepool, thereby increasing the binding of folate cofactor and active 5-FUwith thymidylate synthetase.

FU and leucovorin will be stored and handled according to the countryspecific package inserts. Commercially available 5-FU and leucovorinwill be provided to all patients in the study who are randomized to ArmB and Arm C.

5-FU and leucovorin will be dosed and administered as follows.

Arm 5-FU will be administered at a dose of 2000 mg/m² as an IV Binfusion over 24-hours, (+/−30 minutes), every week for 4 weeks (days 1,8, 15 and 22), followed by 2 weeks of rest, in a 6 week cycle Leucovorinwill be administered at a dose of 200 mg/m² (l form) or 400 mg/m² (l + dracemic form) as an IV infusion over 30 minutes, every week for 4 weeks(days 1, 8, 15 and 22), followed by 2 weeks of rest, in a 6 week cycleArm 5-FU will be administered at a dose of 2400 mg/m² as an IV Cinfusion over 46-hours, (+/−60 minutes), every 2 weeks Leucovorin willbe administered at a dose of 200 mg/m² (l form) or 400 mg/m² (l + dracemic form) as an IV infusion over 30 minutes, every 2 weeks

Leucovorin should be reconstituted per the instructions on the packageinset or standard institutional guidelines for reconstitution ofleucovorin. Leucovorin should be administered prior to the 5-FUinfusion.

Actual dose of 5-FU and leucovorin to be administered will be determinedby calculating the patient's body surface area prior to each cycle. A+/−5% variance in the calculated total dose will be allowed for ease ofdose administration.

After cycle 1, for the start of each new cycle, a window period of +/−3days will be permitted, and a window period of +/−1 day will bepermitted for the Day 8, 15 and 22 infusions.

All patients must be premedicated prior to 5-FU and leucovorin infusionwith standard doses of dexamethasone, prochlorperazine or equivalentother anti-emetics as per standard institutional practices for 5-FUadministration.

G. Important Treatment Considerations with MM-398

Data from previous MM-398 studies does not show any unexpected toxicitywhen compared to the active ingredient, irinotecan, which has beenstudied extensively. The warnings and precautions for the use ofirinotecan and the treatment procedures for managing those toxicitiesare provided below.

Diarrhea

Irinotecan can induce both early and late forms of diarrhea that appearto be mediated by different mechanisms. Early diarrhea (occurring duringor shortly after infusion of irinotecan) is cholinergic in nature. It isusually transient and only infrequently severe. It may be accompanied bysymptoms of rhinitis, increased salivation, miosis, lacrimation,diaphoresis, flushing, and intestinal hyper-peristalsis that can causeabdominal cramping. For patients who experienced early cholinergicsymptoms during the previous cycle of MM-398, prophylacticadministration of atropine will be given at the discretion of theinvestigator.

Late diarrhea (generally occurring more than 24 hours afteradministration of irinotecan) can be life threatening since it may beprolonged and may lead to dehydration, electrolyte imbalance, or sepsis.Late diarrhea should be treated promptly with loperamide, and octreotideshould be considered if diarrhea persists after loperamide. Loss offluids and electrolytes associated with persistent or severe diarrheacan result in life threatening dehydration, renal insufficiency, andelectrolyte imbalances, and may contribute to cardiovascular morbidity.The risk of infectious complications is increased, which can lead tosepsis in patients with chemotherapy-induced neutropenia. Patients withdiarrhea should be carefully monitored, given fluid and electrolytereplacement if they become dehydrated, and given antibiotic support ifthey develop ileus, fever, or severe neutropenia.

Neutropenia

Deaths due to sepsis following severe neutropenia have been reported inpatients treated with irinotecan. Neutropenic complications should bemanaged promptly with antibiotic support. G-CSF may be used to manageneutropenia, with discretion. Patients, who are known to haveexperienced Grade 3 or 4 neutropenia while receiving prioranti-neoplastic therapy, should be monitored carefully and managed.

Hypersensitivity

Hypersensitivity reactions including severe anaphylactic oranaphylactoid reactions have been observed. Suspected drugs should bewithheld immediately and aggressive therapy should be given ifhypersensitivity reactions occur.

Colitis/Ileus

Cases of colitis complicated by ulceration, bleeding, ileus, andinfection have been observed. Patients experiencing ileus should receiveprompt antibiotic support.

Thromboembolism

Thromboembolic events have been observed in patients receivingirinotecan-containing regimens; the specific cause of these events hasnot been determined.

Pregnancy

The pregnancy category of irinotecan is D. Women of childbearingpotential should be advised to avoid becoming pregnant while receivingtreatment with irinotecan. If a pregnancy is reported, treatment shouldbe discontinued. The patient should be withdrawn from the study, and thepregnancy should be followed until the outcome becomes known.

Care of Intravenous Site

Care should be taken to avoid extravasation, and the infusion siteshould be monitored for signs of inflammation. Should extravasationoccur, flushing the site with sterile saline and applications of ice arerecommended.

Patients at Particular Risk

In clinical trials of the weekly schedule of irinotecan, it has beennoted that patients with modestly elevated baseline serum totalbilirubin levels (1.0 to 2.0 mg/dL) have had a significantly greaterlikelihood of experiencing first-cycle grade 3 or 4 neutropenia thanthose with bilirubin levels that were less than 1.0 mg/dL (50.0% [19/38]versus 17.7% [47/226]; p<0.001). Patients with abnormal glucuronidationof bilirubin, such as those with Gilbert's syndrome, may also be atgreater risk of myelosuppression when receiving therapy with irinotecan.

Acute Infusion Associated Reactions

Acute infusion-associated reactions characterized by flushing, shortnessof breath, facial swelling, headache, chills, back pain, tightness ofchest or throat, and hypotension have been reported in a small number ofpatients treated with liposome drugs. In most patients, these reactionsgenerally resolve within 24 hours after the infusion is terminated. Insome patients, the reaction resolves by slowing the rate of infusion.Most patients who experienced acute infusion reactions to liposome drugsare able to tolerate further infusions without complications.

Other Toxicity Potential

MM-398, the new liposome formulation of irinotecan, is different fromirinotecan in unencapsulated formulation, so there is a potential fortoxicities other than those caused by irinotecan. All patients should bemonitored closely for signs and symptoms indicative of drug toxicity,particularly during the initial administration of treatment.

H. Dose Modification Requirements

Dosing may be held for up to 3 weeks from when it was due, to allow forrecovery from toxicity related to the study treatments. If the timerequired for recovery from toxicity is more than 3 weeks, the patientshould be discontinued from the study, unless the patient is benefitingfrom the study treatment, in which case the patient's continuation onstudy should be discussed between Investigator and Sponsor or itsdesignee regarding risks and benefits of continuation.

If a patient's dose is reduced during the study due to toxicity, itshould remain reduced for the duration of the study; dose re-escalationto an earlier dose is not permitted. Any patient who has 2 dosereductions and experiences an adverse event that would require a thirddose reduction must be discontinued from study treatment.

Infusion reactions will be monitored. Infusion reactions will be definedaccording to the National Cancer Institute CTCAE (Version 4.0)definition of an allergic reaction/infusion reaction and anaphylaxis, asdefined below:

Grade 1: Transient flushing or rash, drug fever <38° C. (<100.4° F.);intervention not indicated Grade 2: Intervention or infusioninterruption indicated; responds promptly to symptomatic treatment(e.g., antihistamines, NSAIDS, narcotics); prophylactic medicationsindicated for <24 hrs Grade 3: Symptomatic bronchospasm, with or withouturticaria; parenteral intervention indicated; allergy-relatededema/angioedema; hypotension Grade 4: Life-threatening consequences;urgent intervention indicatedStudy site policies or the following treatment guidelines shall be usedfor the management of infusion reactions.

Grade 1 Slow infusion rate by 50% Monitor patient every 15 minutes forworsening of condition Grade 2 Stop infusion Administer diphenhydraminehydrochloride 50 mg IV, acetaminophen 650 mg orally, and oxygen Resumeinfusion at 50% of the prior rate once infusion reaction has resolvedMonitor patient every 15 minutes for worsening of condition For allsubsequent infusions, premedicate with diphenhydramine hydrochloride25-50 mg IV Grade 3 Stop infusion and disconnect infusion tubing frompatient Administer diphenhydramine hydrochloride 50 mg IV, dexamethasone10 mg IV, bronchodilators for bronchospasm, and other medications oroxygen as medically necessary No further treatment with MM-398 will bepermitted Grade 4 Stop the infusion and disconnect infusion tubing frompatient Administer epinephrine, bronchodilators or oxygen as indicatedfor bronchospasm Administer diphenhydramine hydrochloride 50 mg IV,dexamethasone 10 mg IV Consider hospital admission for observation Nofurther treatment with MM-398 will be permitted

For patients who experience a Grade 1 or Grade 2 infusion reaction,future infusions may be administered at a reduced rate (over 120minutes), with discretion.

For patients who experience a second grade 1 or 2 infusion reaction,administer dexamethasone 10 mg IV. All subsequent infusions should bepremedicated with diphenhydramine hydrochloride 50 mg IV, dexamethasone10 mg IV, and acetaminophen 650 mg orally.

I. MM-398 Dose Modifications for Hematological Toxicities

Prior to initiating a new cycle of therapy, the patients must have:

-   -   ANC≧1500/mm³    -   Platelet count≧100,000/mm³        Treatment should be delayed to allow sufficient time for        recovery and upon recovery, treatment should be administered        according to the guidelines in the tables below. If the patient        had febrile neutropenia, the ANC must have resolved to ≧1500/mm³        and the patient must have recovered from infection.

TABLE MM-398 Dose Modifications for Neutrophil Count MM-398 Dose forNext Cycle^(a) Arm A: Patients Homozygous ANC: cells/mm³ Arm A: PatientsNot for UGT1A1*28^(d) Arm C: Patients (Worst CTCAE Homozygous for Arm C:Patients Not Homozygous for grade) UGT1A1*28 Homozygous for UGT1A1*28UGT1A1*28^(d) ≧1000 to 1999 100% of previous dose 100% of previous dose100% of previous dose (Grade 1 or 2) <1000 Reduce dose by 20 mg/m²Reduce dose to 60 mg/m² for the Reduce dose to 50 mg/m² (Grade 3/4) orto a minimum dose of 80 mg/m^(2b) first occurrence and to 50 mg/m² forthe first febrile neutropenia for the second occurrence^(c,d) occurrenceand to 40 mg/m² for the second occurrence^(e,d) ^(a)All dosemodifications should be based on the worst preceding toxicity^(b)Patients who require a further dose reduction beyond 80 mg/m² mustbe withdrawn from the study ^(c)Patients who require a further dosereduction beyond 50 mg/m² must be withdrawn from the study ^(d)Patientswho are homozygous for UGT1A1*28 and have had their dose increasedshould be dose reduced per guidelines for patients who are nothomozygous for UGT1A1*28 ^(e)Patients who require a further dosereduction beyond 40 mg/m² must be withdrawn from the study

TABLE MM-398 Dose Modifications for Other Hematologic Toxicity MM-398Dose for Next Cycle^(a) Worst Arm A: Patients Homozygous for ToxicityArm A: Patients Not UGT1A1*28^(d) Arm C: Patients CTCAE Homozygous forArm C: Patients Not Homozygous for Grade UGT1A1*28 Homozygous forUGT1A1*28 UGT1A1*28^(d) ≦Grade 2 100% of previous dose 100% of previousdose 100% of previous dose Grade 3/4 Reduce dose by 20 mg/m² Reduce doseto 60 mg/m² for the Reduce dose to 50 mg/m² to a minimum dose of 80mg/m^(2b) first occurrence and to 50 mg/m² for for the first occurrencethe second occurrence^(c,d) and to 40 mg/m² for the secondoccurrence^(e,d) ^(a)All dose modifications should be based on the worstpreceding toxicity ^(b)Patients who require a further dose reductionbeyond 80 mg/m2 must be withdrawn from the study ^(c)Patients whorequire a further dose reduction beyond 50 mg/m2 must be withdrawn fromthe study ^(d)Patients who are homozygous for UGT1A1*28 and have hadtheir dose increased should be dose reduced per guidelines for patientswho are not homozygous for UGT1A1*28 ^(e)Patients who require a furtherdose reduction beyond 40 mg/m² must be withdrawn from the study

J. MM-398 Dose Modifications for Non-Hematological Toxicities

Treatment should be delayed until diarrhea resolves to ≦Grade 1, and forother Grade 3 or 4 non-hematological toxicities, until they resolve toGrade 1 or baseline. Guidelines for dose adjustment of MM-398 for drugrelated diarrhea and other Grade 3 or 4 non-hematological toxicities areprovided below. Infusion reactions should be handled as described above.

TABLE MM-398 Dose Modifications for Diarrhea MM-398 Dose for NextCycle^(a) Arm A: Patients Homozygous for UGT1A1*28^(d) Arm A: PatientsNot Arm C: Patients Not Arm C: Patients Worst Toxicity CTCAE Homozygousfor Homozygous for Homozygous for Grade UGT1A1*28 UGT1A1*28UGT1A1*28^(d) Grade 1 or 2 (2-3 stools/ 100% of previous dose 100% ofprevious dose 100% of previous dose day > pretreatment or 4-6stools/day > pretreatment) Grade 3 (7-9 stools/day > Reduce dose by 20mg/m² Reduce dose to 60 mg/m² for Reduce dose to 50 mg/m² pretreatment)or Grade 4 to a minimum the first occurrence and to for the firstoccurrence (>10 stools/day > dose of 80 mg/m^(2b) 50 mg/m² for thesecond and to 40 mg/m² for the pretreatment) occurrence^(c,d) secondoccurrence^(e,d) ^(a)All dose modifications should be based on the worstpreceding toxicity ^(b)Patients who require a further dose reductionbeyond 80 mg/m² must be withdrawn from the study ^(c)Patients whorequire a further dose reduction beyond 50 mg/m² must be withdrawn fromthe study ^(d)Patients who are homozygous for UGT1A1*28 and have hadtheir dose increased should be dose reduced per guidelines for patientswho are not homozygous for UGT1A1*28 ^(e)Patients who require a furtherdose reduction beyond 40 mg/m² must be withdrawn from the study

TABLE MM-398 Dose Modifications for Non-Hematological Toxicities Otherthan Diarrhea, Asthenia and Grade 3 Anorexia^(d) MM-398 Dose for NextCycle^(a) Arm A: Patients Homozygous for UGT1A1*28^(e) Arm A: PatientsNot Arm C: Patients Not Arm C: Patients Worst Toxicity CTCAE Homozygousfor Homozygous for Homozygous for Grade UGT1A1*28 UGT1A1*28UGT1A1*28^(e) Grade 1 or 2 100% of previous dose 100% of previous dose100% of previous dose Grade 3 or 4 (except nausea Reduce dose by 20mg/m² Reduce dose to 60 mg/m² for Reduce dose to 50 mg/m² and vomiting)to a minimum the first occurrence and to for the first occurrence doseof 80 mg/m^(2b) 50 mg/m² for the second and to 40 mg/m² for theoccurrence^(c,e) second occurrence^(f,e) Grade 3 or 4 nausea and orOptimize anti-emetic Optimize anti-emetic therapy Optimize anti-emeticvomiting despite anti emetic therapy AND reduce AND reduce dose to 60mg/m²; therapy AND reduce therapy dose by 20 mg/m² to a if the patientis dose to 50 mg/m²; if the minimum dose of 80 mg/m^(2b) alreadyreceiving 60 mg/m², patient is already reduce dose to 50 mg/m^(2c,e)receiving 50 mg/m², reduce dose to 40 mg/m^(2f,e) ^(a)All dosemodifications should be based on the worst preceding toxicity^(b)Patients who require a further dose reduction beyond 80 mg/m² mustbe withdrawn from the study ^(c)Patients who require a further dosereduction beyond 50 mg/m² must be withdrawn from the study ^(d)Astheniaand Grade 3 Anorexia do not require dose modification ^(e)Patients whoare homozygous for UGT1A1*28 and have had their dose increased should bedose reduced per guidelines for patients who are not homozygous forUGT1A1*28 ^(f)Patients who require a further dose reduction beyond 40mg/m² must be withdrawn from the study

K. 5-FU and Leucovorin Dose Modifications (Arm B and Arm C)

Guidelines for 5-FU dose modifications are provided below. No doseadjustments for toxicity are required for leucovorin. Leucovorin must begiven immediately prior to each 5-FU dose; hence, if 5-FU dose is held,leucovorin dose should be held as well. In case a patient experiences aninfusion reaction, either institutional guidelines or the guidelinesprovided for MM-398 infusion reaction management should be used.

L. 5-FU Dose Modifications for Hematological Toxicities

Prior to the next dose in a cycle or prior to initiating a new cycle oftherapy, the patients must have:

-   -   ANC≧1500/mm³    -   WBC≧3500/mm³    -   Platelet count≧75,000/mm³ (according to the European summary of        product characteristics for 5-FU, the platelets should have        recovered to ≧100,000/mm³ prior to initiating therapy)

Treatment should be delayed to allow sufficient time for recovery andupon recovery, treatment should be administered according to theguidelines provided in the table below. The duration of the cycles isfixed at 6 weeks, and if a patient is unable to receive the D8, D15 orD22 dose due to toxicity, the dose will be considered as skipped.

TABLE 5-FU Dose Modifications for Hematological Toxicities (Arm B & C)ANC Platelets 5-FU Dose for 5-FU Dose for (cells/mm³) (cells/mm³) D8,D15, D22^(a) Next Cycle^(a) ≧1000 and ≧50,000 100% of previous 100% ofdose previous dose 500-999 Or <50,000-25,000 Hold; when Reduce doseresolved, reduce by 25%^(b) dose by 25%^(b) <500 or Or <25,000 or Holddose; when Reduce dose febrile thrombocytopenia resolved, reduce by25%^(b) neutropenia with bleeding dose by 25%^(b) ^(a)All dosemodifications should be based on the worst preceding toxicity^(b)Patients who require more than 2 dose reductions must be withdrawnfrom the study

M. 5-FU Dose Modifications for Non-Hematological Toxicities

Treatment should be delayed until all Grade 3 or 4 non-hematologicaltoxicities resolve to Grade 1 or baseline. Guidelines for doseadjustment of 5-FU related toxicities are provided below. The durationof the cycles is fixed at 6 weeks, and if a patient is unable to receivethe D8, D15 or D22 dose due to toxicity, the dose will be considered asskipped.

TABLE 5-FU Dose Modifications for Non-Hematological Toxicities Otherthan Asthenia and Grade 3 Anorexia^(c) (Arm B & C) Worst Toxicity CTCAEGrade 5-FU Dose for D8, D15, D22^(a) 5-FU Dose for Next Cycle^(a) Grade1 or 2 100% of previous dose, except for 100% of previous dose, exceptfor Grade 2 hand foot syndrome, Grade Grade 2 hand and foot syndrome,Grade 2 cardiac toxicity, or any grade 2 cardiac toxicity, or any gradeneurocerebellar toxicity neurocerebellar toxicity Grade 2 hand footsyndrome Reduce dose by 25%^(b) Reduce dose by 25%^(b) Any gradeneurocerebellar Discontinue therapy Discontinue therapy or ≧Grade 2cardiac toxicity Grade 3 or 4 Hold; when resolved, reduce dose by Reducedose by 25%^(b), except for Grade 25%^(b), except for Grade 3 or 4 hand3 or 4 hand foot syndrome foot syndrome Grade 3 or 4 hand footDiscontinue therapy Discontinue therapy syndrome ^(a)All dosemodifications should be based on the worst preceding toxicity^(b)Patients who require more than 2 dose reductions must be withdrawnfrom the study ^(c)Asthenia and Grade 3 Anorexia do not require dosemodification

N. Other Toxicities Requiring Special Attention

For both 5-FU and MM-398 treatment arms, QTc prolongation that occurs inthe setting of diarrhea induced electrolyte imbalance should be treatedby with appropriate electrolyte repletion. Once the underlyingabnormality is corrected and the ECG abnormalities have reversed,treatment may continue under careful monitoring and with appropriatedose modification for diarrhea as described above.

O. Concomitant Therapy

All concurrent medical conditions and complications of the underlyingmalignancy will be treated at the discretion of the Investigatoraccording to acceptable local standards of medical care. Patients shouldreceive analgesics, antiemetics, antibiotics, anti-pyretics, and bloodproducts as necessary. Although warfarin-type anticoagulant therapiesare permitted, careful monitoring of coagulation parameters isimperative, in order to avoid complications of any possible druginteractions. All concomitant medications, including transfusions ofblood products, will be recorded on the appropriate case report form.

Guidelines for treating certain medical conditions are discussed below;however, institutional guidelines for the treatment of these conditionsmay also be used. The concomitant therapies that warrant specialattention are discussed below.

Antiemetic Medications

Dexamethasone and a 5-HT3 blocker (e.g., ondansetron or granisetron)will be administered to all patients as premedications unlesscontraindicated for the individual patient. Antiemetics will also beprescribed as clinically indicated during the study period.

Colony Stimulating Factors

Use of granulocyte colony-stimulating factors (G-CSF) is permitted totreat patients with neutropenia or neutropenic fever; prophylactic useof G-CSF will be permitted only in those patients who have had at leastone episode of grade 3 or 4 neutropenia or neutropenic fever whilereceiving study therapy or have had documented grade 3 or 4 neutropeniaor neutropenic fever while receiving prior anti-neoplastic therapy.

Therapy for Diarrhea

Acute diarrhea and abdominal cramps, developing during or within 24hours after MM-398 administration, may occur as part of a cholinergicsyndrome. The syndrome will be treated with atropine. Prophylactic ortherapeutic administration of atropine should be considered in patientsexperiencing cholinergic symptoms during the study.

Diarrhea can be debilitating and on rare occasions is potentiallylife-threatening. Guidelines developed by an ASCO panel for treatingchemotherapy-induced diarrhea are abstracted below.

TABLE Recommendations for Management of Chemotherapy Induced DiarrheaClinical Presentation Intervention Diarrhea, any grade Oral loperamide(2 mg every 2 hours for irinotecan induced diarrhea; 2 mg every 4 hoursfor 5-FU induced diarrhea): continue until diarrhea-free for ≧12 hoursDiarrhea persists on Oral fluoroquinolone × 7 days loperamide for >24hours Diarrhea persists on Stop loperamide; hospitalize patient;loperamide for >48 hours administer IV fluids ANC <500 cells/μL, Oralfluoroquinolone (continue until regardless of fever or diarrhearesolution of neutropenia) Fever with persistent Oral fluoroquinolone(continue until diarrhea, even in the resolution of fever and diarrhea)absence of neutropenia

The synthetic octapeptide octreotide has been shown to be effective inthe control of diarrhea induced by fluoropyrimidine-based chemotherapyregimens when administered as an escalating dose by continuous infusionor subcutaneous injection. Octreotide can be administered at dosesranging from 100 micrograms twice daily to 500 micrograms three timesdaily, with a maximum tolerated dose of 2000 micrograms three timesdaily in a 5-day regimen. Patients should be advised to drink watercopiously throughout treatment.

Other Treatments

Symptomatic treatment for other toxicities should be per institutionalguidelines. Prevention of alopecia with cold cap or of stomatitis withiced mouth rinses is allowed.

P. Prohibited Therapy

The following drugs are noted in the irinotecan prescribing informationas interacting with irinotecan: St. John's Wort, CYP3A4 inducinganticonvulsants (phenytoin, phenobarbital, and carbamazepine),ketoconazole, itraconazole, troleandomycin, erythromycin, diltiazem andverapamil. Treatment with these agents and any other that interact withirinotecan, should be avoided wherever possible. Because 5-FU interactswith warfarin, caution should be exercised if concomitant use isnecessary. Refer to the country specific package inserts of 5-FU andleucovorin for any other drug interactions.

The following therapies are not permitted during the trial:

-   -   Other anti-neoplastic therapy, including cytotoxics, targeted        agents, endocrine therapy or other antibodies;    -   Potentially curative radiotherapy; palliative radiotherapy is        permitted; and    -   Any other investigational therapy is not permitted.

Q. Laboratory Procedures

Complete Blood Count

A complete blood count (CBC) will be performed locally, and must includea white blood count (WBC) and differential, hemoglobin, hematocrit andplatelet count.

Serum Chemistry

Serum chemistry panel will be performed centrally. Additionally,chemistry may also be assessed locally, and local lab results may beused for enrollment and treatment decisions, if central lab results arenot available. If local lab results are used for enrollment, then locallab results must be used for all subsequent treatment decisions. Serumchemistry will include electrolytes (sodium, potassium, chloride andbicarbonate), BUN, serum creatinine, glucose, direct and totalbilirubin, AST, ALT, alkaline phosphatase, LDH, uric acid, totalprotein, albumin, calcium, magnesium and phosphate.

CA 19-9

CA 19-9 levels will be measured centrally for all patients.

Pregnancy Test

All women of child bearing potential must undergo a urine or serumpregnancy test.

UGT1A1*28 Allele

A whole blood sample will be collected from all patients at baseline andsent to the central lab to test for UGT1A1*28 allele status. Local labresults may be used if the central lab results are not available at thetime of randomization.

Pharmacokinetic Assessments

PK analysis will be done centrally. Plasma PK samples will be collectedin Cycle 1, from all patients randomized in this study, at the followingtimepoints:

-   -   Arm A: just prior to infusion, during infusion (at 80 to 90        minutes after start of infusion), between 2 and a half and four        hours after the start of infusion and on C1D8    -   Arm B: one sample at the end of 5-FU infusion (C1D2)    -   Arm C: just prior to MM-398 infusion, during MM-398 infusion (at        80 to 90 minutes after start of infusion), between 2 and a half        and four hours after the start of MM-398 infusion, at the end of        5-FU infusion and on C1D8

In addition, a PK sample will be collected in Cycle 1, any time between8 and 72 hours following administration of MM-398, from patientsrandomized to Arm A and Arm C, who provide an additional consent forcollection of this sample.

R. Pain Assessment and Analgesic Consumption

Pain assessment and analgesic consumption diaries will be provided tothe patients for recording their pain intensity daily on a visualanalogue scale and to document their daily analgesic use.

S. EORTC-QLQ-C30

Quality of life will be assessed by the EORTC-QLQ-C30 instrument. TheEORTC-QLQ-C30 is a reliable and valid measure of the quality of life ofcancer patients in multicultural clinical research settings. Itincorporates nine multi-item scales: five functional scales (physical,role, cognitive, emotional, and social); three symptom scales (fatigue,pain, and nausea and vomiting); and a global health and quality-of-lifescale. Several single-item symptom measures are also included.

Patients will be required to complete the EORTC-QLQ-C30 questionnaire attimepoints outlined in the Schedule of Assessment. On days that thepatient is to receive study drug, assessments should be completed priorto study drug administration. Only those patients, for whom validatedtranslations of the EORTC-QLQ-C30 questionnaire are available, will berequired to complete the questionnaire.

T. Overall Survival/Post Study Follow-Up

Overall survival data will be collected after a patient completes the 30day follow-up visit, every 1 month (+/−1 week) from the date of the 30day follow-up visit. Post-discontinuation data to be collected willinclude: the date of disease progression (if not already documented; ifpatient discontinued from study treatment for reasons other thanobjective disease progression, patient should continue to undergo tumorassessment every 6 weeks, until commencement of new anti-neoplastictherapy or progressive disease); documentation of any anticancertreatment patient has received including the dates of anypost-discontinuation systemic therapy, radiotherapy, or surgicalintervention; and the date of death. All patients must be followed-upuntil death or study closure, whichever occurs first.

U. Determining the Severity and Relatedness of Adverse Events

Each adverse event will be graded according to the NCI CTCAE V 4.0,which may be found at http://ctep.cancer.gov/reporting/ctc.html. Forevents not listed in the CTCAE, severity will be designated as mild,moderate, severe or life threatening or fatal, which correspond toGrades 1, 2, 3, 4 and 5, respectively on the NCI CTCAE, with thefollowing definitions:

-   -   Mild: an event not resulting in disability or incapacity and        which resolves without intervention;    -   Moderate: an event not resulting in disability or incapacity but        which requires intervention;    -   Severe: an event resulting in temporary disability or incapacity        and which requires intervention;    -   Life-threatening: an event in which the patient was at risk of        death at the time of the event    -   Fatal: an event that results in the death of the patient        The Investigator must attempt to determine if there exists        reasonable possibility that an adverse event is related to the        use of the study drug. This relationship should be described as        related or non-related.

V. Analysis of the Overall Survival

Overall survival (OS) is the primary endpoint of this study. Overallsurvival is defined as the time from the date of patient randomizationto date of death or the date last known alive. For each patient who isnot known to have died as of the data-inclusion cut-off date for aparticular analysis, OS will be censored for that analysis at the dateof last contact prior to the data cut-off date.

The study primary analysis will involve two pair-wise comparisons ofsurvival between the study treatments, in the ITT population usingun-stratified Log Rank Test. The testing will be according to theBonferroni-Holm procedure which strongly controls the family-wise errorrate at 0.05 (two-sided) level [25]:

Reject H_(D) ¹:S_(A)(t)=S_(B)(t), i.e. no effect of MM-398 monotherapyrelative to control, if the log rank p-value for this test is less than0.025 or if the log rank p-value for this test is less than 0.05 and thelog rank p-value for the comparison between Arm B and Arm C is less than0.025.

Reject H_(D) ²:S_(C)(t)=S_(B)(t), i.e. no effect of MM-398 combinationtherapy relative to control, if the log rank p-value for this test isless than 0.025 or if the log rank p-value for this test is less than0.05 and the log rank p-value for the comparison between Arm A and Arm Bis less than 0.025.

Kaplan-Meier analyses will be performed on each treatment group toobtain nonparametric estimates of the survival function and the mediansurvival time. Corresponding 95% confidence intervals will be computedusing the log-log method. Cox proportional hazards modeling will be usedto estimate hazard ratios and corresponding 95% confidence intervals.

The following additional sensitivity analyses will be carried out foroverall survival on the ITT population (except as indicated) to evaluatethe robustness of the primary analysis results:

log-rank comparisons of treatments on the PP population

stratified log rank analyses, using randomization stratification factors[with hazard ratio estimates from stratified Cox modeling]

Wilcoxon comparisons of treatments

Cox regression model with stepwise selection (p value to enter <0.25,p-value to remain <0.15) of model terms where treatment and theprognostic factors (noted below) are candidates for inclusion

univariate analyses to evaluate potential independent prognostic factorsusing Cox regression

subgroup analyses to examine differences in the effects of treatment indifferent segments of the study population.

Repeat all analyses (primary and sensitivity) with only patients whoenrolled under protocol Version 2 (and later)

Prognostic factors to be examined include: baseline KPS, baselinealbumin, ethnicity, geographic location, disease stage at diagnosis,original tumor location, number of prior chemotherapy treatments, priorradiotherapy, prior surgery, time since last treatment, best response onprior treatment, baseline CA 19-9, gender and age.

W. Secondary Efficacy Analyses

Progression Free Survival

PFS is defined as the number of months from the date of randomization tothe date of death or progression, whichever occurred earlier (per RECIST1.1). If neither death nor progression is observed during the study, PFSdata will be censored at the last valid tumor assessment.

PFS will be compared between the treatment groups using pairedun-stratified log-rank tests. The PFS curves will be estimated usingKaplan-Meier estimates. Estimates of the hazard ratios and corresponding95% confidence intervals will be obtained using Cox proportional hazardmodels. Stratified analyses will also be carried out using therandomization stratification factors. Treatment effects adjusting forstratification variables and other prognostic covariates will beexplored. In addition, different censoring and missing data imputingmethods may be used to perform sensitivity analyses on PFS. Methodologyfor the sensitivity analyses will be fully specified in the StatisticalAnalysis Plan.

The analyses will be performed for ITT, PP and EP populations.

Time to Treatment Failure

Time to treatment failure is defined as time from randomization toeither disease progression, death or study discontinuation due totoxicity. Kaplan-Meier analyses as specified for analyses of progressionfree survival will be performed for time to treatment failure.

The analyses will be performed for ITT, PP and EP populations.

Objective Response Rate

The tumor assessment related to ORR will be determined using RECISTv1.1. If the Sponsor requires an independent review of the radiologicalassessments to support a new drug application or for any other reason,the response status of all patients may be reviewed by an independentpanel of clinicians and may be reviewed by the Sponsor or its designee.In case of a discrepancy between the assessment of the independent paneland that of the investigator, the independent panel's assessment willtake precedence.

Objective response rate (ORR) for each treatment group will becalculated combining the number of patients with a best overall responseof confirmed CR or PR per RECIST. The ORR is the best response recordedfrom randomization until progression or end of study. The number andpercentage of patients experiencing objective response (confirmed CR+PR)at the time of analysis will be presented and the 95% confidenceinterval for the proportion will be calculated. Objective response ratesfrom the treatment arms will be compared using pair-wise Fisher's ExactTests. The analyses will be performed for ITT, PP and EP populations.

Tumor Marker Response Analysis

CA 19-9 serum levels will be measured within 7 days before the start oftreatment (baseline), and subsequently every 6 weeks. Tumor markerresponse of CA19-9 will be evaluated by the change of CA19-9 serumlevels. Response is defined as a decrease of 50% of CA 19-9 in relationto the baseline level at least once during the treatment period. Onlypatients with elevated baseline CA 19-9 value (>30 U/mL) will beincluded in the calculation of tumor marker response rate.

Patient Reported Outcome Analyses

Analysis of the EORTC-QLQ-C30 questionnaires will be performed inaccordance with the EORTC guidelines [22].

Safety Analysis

Treatment emergent adverse events will be presented by treatment arm, bypatient, by NCI CTCAE grade and by MedDRA system organ class (SOC).Separate listings will be presented for total adverse events, seriousadverse events, adverse events related to the study drugs and Grade 3and 4 adverse events. Laboratory data will be presented by treatment armand by visit. Abnormal laboratory values will be assessed according toNCI CTCAE grade, where possible. Evaluation of QTc will be done basedupon Fridericia's correction method. CTCAE criteria will be applied tothe QTc_(F) (i.e. Grade 3=QTc>500 msec). All the safety analyses will beperformed by treatment arm, treatment cycle and week, where appropriate.Overall safety will also be evaluated by grade across cycles, SOC andextent of exposure. Additionally, safety analyses will include acomparison between the treatment arms in all patients in the SafetyPopulation:

-   -   Number of blood transfusions required    -   Proportion of patients requiring G-CSF    -   Adverse events resulting in dose delay or modification

Pharmacokinetics Analysis

Pharmacokinetic data will be collected on all patients randomized toeither of the MM-398 arms. Plasma concentration-time data for MM-398will be analyzed using population pharmacokinetic methods.Pharmacokinetic parameters will be estimated by Non-Linear Mixed EffectsModeling using NONMEM®, Version 7, Level 1.0 (ICON DevelopmentSolutions, Dublin, Ireland). PK parameters will include plasma C_(max),T_(max), AUC (area under the concentration curve), clearance, volume ofdistribution, and terminal elimination half-life. The effects of patientspecific factors (age, race, gender, body weight, hepatic and renalfunction measures, ECOG value, etc.) on pharmacokinetic parameters willbe evaluated. Population PK/PD methods will be used to assess therelationships between drug exposure and efficacy and/or toxicity (e.g.neutropenia, diarrhea) parameters. Additional exploratory analysis maybe performed on the PK samples, to help clarify any safety, efficacy orPK issues related to MM-398 that arise during the course of the study.Concentration levels of 5-FU will be summarized descriptively.

Endnotes

While the invention has been described in connection with specificembodiments thereof, it will be understood that it is capable of furthermodifications and this application is intended to cover any variations,uses, or adaptations of the invention following, in general, theprinciples of the invention and including such departures from thepresent disclosure that come within known or customary practice withinthe art to which the invention pertains and may be applied to theessential features set forth herein. The disclosure of each and everyUS, international, or other patent or patent application or publicationreferred to herein is hereby incorporated herein by reference in itsentirety.

What is claimed is:
 1. A method of treating pancreatic cancer in a humanpatient who has previously been treated with gemcitabine, the methodcomprising intravenously administering to the patient in need thereof anantineoplastic therapy once every two weeks, the antineoplastic therapyconsisting of: a. 60-80 mg/m² of liposomal irinotecan compositioncomprising irinotecan liposomes, the irinotecan liposomes in theliposomal irinotecan composition having a diameter of approximately80-140 nm and an irinotecan terminal elimination half-life in thepatient of about 21-48 hours, wherein the irinotecan liposomes comprisephosphatidylcholine, cholesterol, and a polyethyleneglycol-derivatizedphosphatidyl-ethanolamine; b. 200 mg/m² of the (l) form of leucovorin;and c. 2,400 mg/m² of 5-fluorouracil.
 2. The method of claim 1, whereinthe irinotecan liposomes comprise approximately one polyethyleneglycol(PEG) molecule for every 200 phospholipid molecules.
 3. The method ofclaim 1, wherein the irinotecan is converted to SN-38 and the AUC oftotal SN-38 increases less than proportionally with the dose of theliposomal irinotecan.
 4. The method of claim 1, wherein the patient hasfailed prior treatment with gemcitabine or become resistant togemcitabine prior to administration of the liposomal irinotecancomposition.
 5. The method of claim 4, wherein the irinotecan liposomescomprise approximately one polyethyleneglycol (PEG) molecule for every200 phospholipid molecules.
 6. The method of claim 1, wherein the 200mg/m² of the (l) form of leucovorin is provided by administering 400mg/m² of the (l+d) form of leucovorin.
 7. A method of treatingpancreatic cancer in a human patient who has previously been treatedwith gemcitabine, the method comprising intravenously administering tothe patient in need thereof an antineoplastic therapy comprising one ormore two-week treatment cycles, each two-week treatment cycle consistingof the administration, starting on the first day of each two-weektreatment cycle of: a. 60-80 mg/m² of liposomal irinotecan compositioncomprising irinotecan liposomes, the irinotecan liposomes in theliposomal irinotecan composition having a diameter of approximately80-140 nm and an irinotecan terminal elimination half-life in thepatient of about 21 to 48 hours, wherein the irinotecan liposomescomprise irinotecan encapsulated in a unilamellar lipid bilayer vesiclecomposed of phosphatidylcholine, cholesterol, and apolyethyleneglycol-derivatized phosphatidyl-ethanolamine; the irinotecanliposomes administered in combination with b. 200 mg/m² of the (l) formof leucovorin; and c. 2,400 mg/m² of 5-fluorouracil.
 8. The method ofclaim 7, wherein the irinotecan liposomes comprise approximately onepolyethyleneglycol (PEG) molecule for every 200 phospholipid molecules.9. A method of treating pancreatic cancer in a human patient who haspreviously been treated with gemcitabine, the method comprisingintravenously administering to the patient in need thereof anantineoplastic therapy once every two weeks, the antineoplastic therapyconsisting of: a. 60, 70 or 80 mg/m² of liposomal irinotecan compositioncomprising irinotecan liposomes, the irinotecan liposomes in theliposomal irinotecan composition having a diameter of about 80-140 nmand an irinotecan terminal elimination half-life in the patient of about21 to 48 hours, wherein the irinotecan liposomes comprise irinotecanencapsulated in a unilamellar lipid bilayer vesicle composed ofphosphatidylcholine, cholesterol, and a polyethyleneglycol-derivatizedphosphatidyl-ethanolamine; and then administering b. 200 mg/m² of the(l) form of leucovorin over 30 minutes; and then administering c. 2,400mg/m² of 5-fluorouracil over 46 hours; wherein the irinotecan isconverted to SN-38 within the human patient and the AUC of the SN-38increases less than proportionally with the dose of the liposomalirinotecan.
 10. The method of claim 6, wherein administration ofliposomal irinotecan is administered as an infusion over 90 minutes. 11.The method of claim 10, wherein after the irinotecan is administered:the leucovorin is administered over 30 minutes and the 5-fluorouracil isadministered over 46 hours.
 12. The method of claim 11, wherein the doseof liposomal irinotecan is 80 mg/m² and the human patient is nothomozygous for the UGT1A1*28 allele.
 13. The method of claim 7, whereinthe 200 mg/m² of the (l) form of leucovorin is provided by administering400 mg/m² of the (l+d) form of leucovorin.
 14. The method of claim 13,wherein the irinotecan is administered in an infusion over 90 minutes,the leucovorin is administered after the irinotecan over 30 minutes, andthe 5-fluorouracil is administered after the leucovorin over 46 hours.15. The method of claim 14, wherein the dose of liposomal irinotecan is80 mg/m², and the human patient is not homozygous for the UGT1A1*28allele.
 16. The method of claim 9, wherein the 200 mg/m² of the (l) formof leucovorin is provided by administering 400 mg/m² of the (l+d) formof leucovorin.
 17. The method of claim 16, wherein the irinotecan isadministered in an infusion over 90 minutes, the leucovorin isadministered after the irinotecan over 30 minutes and the 5-fluorouracilis administered after the leucovorin over 46 hours.
 18. The method ofclaim 17, wherein the antineoplastic therapy comprises at least threetwo-week treatment cycles.
 19. A method of treating pancreatic cancer ina human patient who has previously been treated with gemcitabine, themethod comprising intravenously administering to the patient in needthereof an antineoplastic therapy once every two weeks, theantineoplastic therapy consisting of: a single dose of 60, 70 or 80mg/m² of a liposomal irinotecan composition comprising irinotecanliposomes, administered in combination with 200 mg/m² of the (l) form ofleucovorin and 2,400 mg/m² of 5-fluorouracil, to treat the pancreaticcancer in the human patient.
 20. The method of claim 19, wherein theirinotecan liposomes have a diameter of about 80-140 nm and anirinotecan terminal elimination half-life in the patient of at leastabout 2-fold higher than that of 125 mg/m² free irinotecan as CPT-11irinotecan hydrochloride injection.
 21. The method of claim 19, whereinthe irinotecan liposomes comprise irinotecan encapsulated in aunilamellar lipid bilayer vesicle composed of phosphatidylcholine,cholesterol, and a polyethyleneglycol-derivatizedphosphatidyl-ethanolamine, and the 200 mg/m² of the (l) form ofleucovorin is provided by administering 400 mg/m² of the (l+d) form ofleucovorin.
 22. The method of claim 21, wherein the irinotecan liposomeshave an irinotecan terminal elimination half-life in the patient ofabout 21 to 48 hours.
 23. The method of claim 22, wherein the irinotecanis converted to SN-38 within the human patient and the AUC of the SN-38increases less than proportionally with the dose of the liposomalirinotecan.
 24. The method of claim 7, wherein the irinotecan isconverted to SN-38 within the human patient and the AUC of the SN-38increases less than proportionally with the dose of the liposomalirinotecan.
 25. The method of claim 1, wherein 80 mg/m² of liposomalirinotecan is administered to a human patient who is not homozygous forthe UGT1A1*28 allele, and the 5-fluorouracil is administered over 46hours starting on the first day of each two week treatment cycle. 26.The method of claim 7, wherein 80 mg/m² of liposomal irinotecan isadministered to a human patient who is not homozygous for the UGT1A1*28allele.
 27. The method of claim 9, wherein 80 mg/m² of liposomalirinotecan is administered to a human patient who is not homozygous forthe UGT1A1*28 allele.
 28. The method of claim 19, wherein 80 mg/m² ofliposomal irinotecan is administered to a human patient who is nothomozygous for the UGT1A1*28 allele.
 29. The method of claim 23, wherein80 mg/m² of liposomal irinotecan is administered to a human patient whois not homozygous for the UGT1A1*28 allele, and the method comprisesadministering the liposomal irinotecan over a 90 minute infusion,followed by administering 400 mg/m² of the (l+d) form of leucovorin over30 minutes, followed by administering the 5-fluorouracil over 46 hours.30. The method of claim 7, wherein the patient has failed priortreatment with gemcitabine or become resistant to gemcitabine prior toadministration of the liposomal irinotecan composition.
 31. The methodof claim 9, wherein the patient has failed prior treatment withgemcitabine or become resistant to gemcitabine prior to administrationof the liposomal irinotecan composition.
 32. The method of claim 19,wherein the patient has failed prior treatment with gemcitabine orbecome resistant to gemcitabine prior to administration of the liposomalirinotecan composition.
 33. The method of claim 1, wherein theantineoplastic therapy comprises at least three two-week treatmentcycles.
 34. The method of claim 7, wherein the antineoplastic therapycomprises at least three two-week treatment cycles.
 35. The method ofclaim 19, wherein the antineoplastic therapy comprises at least threetwo-week treatment cycles.